diff --git a/boomer.go b/boomer.go
index 61367240..d50109cd 100644
--- a/boomer.go
+++ b/boomer.go
@@ -150,6 +150,10 @@ func (b *HRPBoomer) convertBoomerTask(testcase *TestCase, rendezvousList []*Rend
 					}
 				} else if stepData.StepType == stepTypeRendezvous {
 					// rendezvous
+					// TODO: implement rendezvous in boomer
+				} else if stepData.StepType == stepTypeThinkTime {
+					// think time
+					// no record required
 				} else {
 					// request or testcase step
 					b.RecordSuccess(step.Type(), step.Name(), stepData.Elapsed, stepData.ContentSize)
diff --git a/convert.go b/convert.go
index d29b4212..c0f49516 100644
--- a/convert.go
+++ b/convert.go
@@ -156,6 +156,10 @@ func (tc *TCase) ToTestCase() (*TestCase, error) {
 			testCase.TestSteps = append(testCase.TestSteps, &StepTestCaseWithOptionalArgs{
 				step: step,
 			})
+		} else if step.ThinkTime != nil {
+			testCase.TestSteps = append(testCase.TestSteps, &StepThinkTime{
+				step: step,
+			})
 		} else if step.Request != nil {
 			testCase.TestSteps = append(testCase.TestSteps, &StepRequestWithOptionalArgs{
 				step: step,
diff --git a/convert_test.go b/convert_test.go
index ea919646..f92647b7 100644
--- a/convert_test.go
+++ b/convert_test.go
@@ -11,6 +11,7 @@ var (
 	demoTestCaseYAMLPath    TestCasePath = "examples/demo.yaml"
 	demoRefAPIYAMLPath      TestCasePath = "examples/ref_api_test.yaml"
 	demoRefTestCaseJSONPath TestCasePath = "examples/ref_testcase_test.json"
+	demoThinkTimeJsonPath   TestCasePath = "examples/think_time_test.json"
 	demoAPIYAMLPath         APIPath      = "examples/api/put.yml"
 )
 
diff --git a/examples/think_time_test.json b/examples/think_time_test.json
new file mode 100644
index 00000000..fddb4545
--- /dev/null
+++ b/examples/think_time_test.json
@@ -0,0 +1,63 @@
+{
+    "config": {
+        "name": "think time test demo",
+        "variables": {
+            "app_version": "v1",
+            "user_agent": "iOS/10.3"
+        },
+        "base_url": "https://postman-echo.com",
+        "think_time": {
+            "strategy": "random_percentage",
+            "setting": {
+                "min_percentage": 1,
+                "max_percentage": 1.5
+            },
+            "limit": 4
+        },
+        "verify": false
+    },
+    "teststeps": [
+        {
+            "name": "get with params",
+            "request": {
+                "method": "GET",
+                "url": "/get",
+                "headers": {
+                    "User-Agent": "$user_agent,$app_version"
+                }
+            },
+            "validate": [
+                {
+                    "check": "status_code",
+                    "assert": "equals",
+                    "expect": 200,
+                    "msg": "check status code"
+                }
+            ]
+        },
+        {
+            "name": "think time 1",
+            "think_time": {
+                "time": 3
+            }
+        },
+        {
+            "name": "post with params",
+            "request": {
+                "method": "POST",
+                "url": "/post",
+                "headers": {
+                    "User-Agent": "$user_agent,$app_version"
+                }
+            },
+            "validate": [
+                {
+                    "check": "status_code",
+                    "assert": "equals",
+                    "expect": 200,
+                    "msg": "check status code"
+                }
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/examples/think_time_test.yaml b/examples/think_time_test.yaml
new file mode 100644
index 00000000..9f2f5129
--- /dev/null
+++ b/examples/think_time_test.yaml
@@ -0,0 +1,40 @@
+config:
+  name: "think time test demo"
+  variables:
+    app_version: v1
+    user_agent: iOS/10.3
+  base_url: "https://postman-echo.com"
+  think_time:
+    strategy: random_percentage
+    setting:
+      min_percentage: 1.0
+      max_percentage: 1.5
+    limit: 4
+  verify: False
+
+teststeps:
+  - name: get with params
+    request:
+      method: GET
+      url: /get
+      headers:
+        User-Agent: $user_agent,$app_version
+    validate:
+      - check: status_code
+        assert: equals
+        expect: 200
+        msg: check status code
+  - name: think time 1
+    think_time:
+      time: 3
+  - name: post with params
+    request:
+      method: POST
+      url: /post
+      headers:
+        User-Agent: $user_agent,$app_version
+    validate:
+      - check: status_code
+        assert: equals
+        expect: 200
+        msg: check status code
\ No newline at end of file
diff --git a/internal/builtin/function.go b/internal/builtin/function.go
index 6c4a1937..b78d8fc7 100644
--- a/internal/builtin/function.go
+++ b/internal/builtin/function.go
@@ -5,12 +5,15 @@ import (
 	"crypto/md5"
 	"encoding/csv"
 	"encoding/hex"
+	builtinJSON "encoding/json"
+	"errors"
 	"fmt"
 	"math"
 	"math/rand"
 	"os"
 	"os/exec"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"time"
 
@@ -220,3 +223,38 @@ func Contains(s []string, e string) bool {
 	}
 	return false
 }
+
+func GetRandomNumber(min, max int) int {
+	if min > max {
+		return 0
+	}
+	r := rand.Intn(max - min + 1)
+	return min + r
+}
+
+func Interface2Float64(i interface{}) (float64, error) {
+	switch i.(type) {
+	case int:
+		return float64(i.(int)), nil
+	case int32:
+		return float64(i.(int32)), nil
+	case int64:
+		return float64(i.(int64)), nil
+	case float32:
+		return float64(i.(float32)), nil
+	case float64:
+		return i.(float64), nil
+	case string:
+		intVar, err := strconv.Atoi(i.(string))
+		if err != nil {
+			return 0, err
+		}
+		return float64(intVar), err
+	}
+	// json.Number
+	value, ok := i.(builtinJSON.Number)
+	if ok {
+		return value.Float64()
+	}
+	return 0, errors.New("failed to convert interface to float64")
+}
diff --git a/models.go b/models.go
index 2377a770..950206be 100644
--- a/models.go
+++ b/models.go
@@ -3,10 +3,12 @@ package hrp
 import (
 	"fmt"
 	"math/rand"
+	"reflect"
 	"runtime"
 	"sync"
 	"time"
 
+	"github.com/httprunner/hrp/internal/builtin"
 	"github.com/httprunner/hrp/internal/version"
 )
 
@@ -30,13 +32,14 @@ type TConfig struct {
 	Variables         map[string]interface{} `json:"variables,omitempty" yaml:"variables,omitempty"`
 	Parameters        map[string]interface{} `json:"parameters,omitempty" yaml:"parameters,omitempty"`
 	ParametersSetting *TParamsConfig         `json:"parameters_setting,omitempty" yaml:"parameters_setting,omitempty"`
+	ThinkTime         *ThinkTimeConfig       `json:"think_time,omitempty" yaml:"think_time,omitempty"`
 	Export            []string               `json:"export,omitempty" yaml:"export,omitempty"`
 	Weight            int                    `json:"weight,omitempty" yaml:"weight,omitempty"`
 	Path              string                 `json:"path,omitempty" yaml:"path,omitempty"` // testcase file path
 }
 
 type TParamsConfig struct {
-	Strategy  interface{} `json:"strategy,omitempty" yaml:"strategy,omitempty"`
+	Strategy  interface{} `json:"strategy,omitempty" yaml:"strategy,omitempty"` // map[string]string、string
 	Iteration int         `json:"iteration,omitempty" yaml:"iteration,omitempty"`
 	Iterators []*Iterator `json:"parameterIterator,omitempty" yaml:"parameterIterator,omitempty"` // 保存参数的迭代器
 }
@@ -46,6 +49,82 @@ const (
 	strategySequential string = "Sequential"
 )
 
+type ThinkTimeConfig struct {
+	Strategy string      `json:"strategy,omitempty" yaml:"strategy,omitempty"` // default、random、limit、multiply、ignore
+	Setting  interface{} `json:"setting,omitempty" yaml:"setting,omitempty"`   // random(map): {"min_percentage": 0.5, "max_percentage": 1.5}; 10、multiply(float64): 1.5
+	Limit    float64     `json:"limit,omitempty" yaml:"limit,omitempty"`       // limit think time no more than specific time, ignore if value <= 0
+}
+
+const (
+	thinkTimeDefault          string = "default"           // as recorded
+	thinkTimeRandomPercentage string = "random_percentage" // use random percentage of recorded think time
+	thinkTimeMultiply         string = "multiply"          // multiply recorded think time
+	thinkTimeIgnore           string = "ignore"            // ignore recorded think time
+)
+
+const (
+	thinkTimeDefaultMultiply = 1
+)
+
+var (
+	thinkTimeDefaultRandom = map[string]float64{"min_percentage": 0.5, "max_percentage": 1.5}
+)
+
+func (ttc *ThinkTimeConfig) checkThinkTime() {
+	if ttc == nil {
+		return
+	}
+	// unset strategy, set default strategy
+	if ttc.Strategy == "" {
+		ttc.Strategy = thinkTimeDefault
+	}
+	// check think time
+	if ttc.Strategy == thinkTimeRandomPercentage {
+		if ttc.Setting == nil || reflect.TypeOf(ttc.Setting).Kind() != reflect.Map {
+			ttc.Setting = thinkTimeDefaultRandom
+			return
+		}
+		value, ok := ttc.Setting.(map[string]interface{})
+		if !ok {
+			ttc.Setting = thinkTimeDefaultRandom
+			return
+		}
+		if _, ok := value["min_percentage"]; !ok {
+			ttc.Setting = thinkTimeDefaultRandom
+			return
+		}
+		if _, ok := value["max_percentage"]; !ok {
+			ttc.Setting = thinkTimeDefaultRandom
+			return
+		}
+		left, err := builtin.Interface2Float64(value["min_percentage"])
+		if err != nil {
+			ttc.Setting = thinkTimeDefaultRandom
+			return
+		}
+		right, err := builtin.Interface2Float64(value["max_percentage"])
+		if err != nil {
+			ttc.Setting = thinkTimeDefaultRandom
+			return
+		}
+		ttc.Setting = map[string]float64{"min_percentage": left, "max_percentage": right}
+	} else if ttc.Strategy == thinkTimeMultiply {
+		if ttc.Setting == nil {
+			ttc.Setting = float64(0) // default
+			return
+		}
+		value, err := builtin.Interface2Float64(ttc.Setting)
+		if err != nil {
+			ttc.Setting = float64(0) // default
+			return
+		}
+		ttc.Setting = value
+	} else if ttc.Strategy != thinkTimeIgnore {
+		// unrecognized strategy, set default strategy
+		ttc.Strategy = thinkTimeDefault
+	}
+}
+
 type paramsType []map[string]interface{}
 
 type Iterator struct {
@@ -145,6 +224,7 @@ type TStep struct {
 	TestCaseContent ITestCase              `json:"testcase_content,omitempty" yaml:"testcase_content,omitempty"`
 	Transaction     *Transaction           `json:"transaction,omitempty" yaml:"transaction,omitempty"`
 	Rendezvous      *Rendezvous            `json:"rendezvous,omitempty" yaml:"rendezvous,omitempty"`
+	ThinkTime       *ThinkTime             `json:"think_time,omitempty" yaml:"think_time,omitempty"`
 	Variables       map[string]interface{} `json:"variables,omitempty" yaml:"variables,omitempty"`
 	SetupHooks      []string               `json:"setup_hooks,omitempty" yaml:"setup_hooks,omitempty"`
 	TeardownHooks   []string               `json:"teardown_hooks,omitempty" yaml:"teardown_hooks,omitempty"`
@@ -160,8 +240,13 @@ const (
 	stepTypeTestCase    stepType = "testcase"
 	stepTypeTransaction stepType = "transaction"
 	stepTypeRendezvous  stepType = "rendezvous"
+	stepTypeThinkTime   stepType = "thinktime"
 )
 
+type ThinkTime struct {
+	Time float64 `json:"time" yaml:"time"`
+}
+
 type transactionType string
 
 const (
diff --git a/plugin.go b/plugin.go
index 6a8b58b9..16068cc5 100644
--- a/plugin.go
+++ b/plugin.go
@@ -41,7 +41,6 @@ func initPlugin(path string, logOn bool) (plugin funplugin.IPlugin, err error) {
 	go func() {
 		<-c
 		plugin.Quit()
-		os.Exit(0)
 	}()
 
 	// report event for initializing plugin
diff --git a/runner.go b/runner.go
index fadd503c..2564bc05 100644
--- a/runner.go
+++ b/runner.go
@@ -297,13 +297,16 @@ func (r *caseRunner) run() error {
 func (r *caseRunner) runStep(index int, caseConfig *TConfig) (stepResult *stepData, err error) {
 	step := r.TestCase.TestSteps[index]
 
-	// step type priority order: transaction > rendezvous > testcase > request
+	// step type priority order: transaction > rendezvous > thinktime > testcase > request
 	if stepTran, ok := step.(*StepTransaction); ok {
 		// transaction step
 		return r.runStepTransaction(stepTran.step.Transaction)
 	} else if stepRend, ok := step.(*StepRendezvous); ok {
 		// rendezvous step
 		return r.runStepRendezvous(stepRend.step.Rendezvous)
+	} else if stepThink, ok := step.(*StepThinkTime); ok {
+		// think time step
+		return r.runStepThinkTime(stepThink.step, caseConfig.ThinkTime)
 	}
 
 	log.Info().Str("step", step.Name()).Msg("run step start")
@@ -377,6 +380,52 @@ func (r *caseRunner) runStep(index int, caseConfig *TConfig) (stepResult *stepDa
 	return stepResult, err
 }
 
+func (r *caseRunner) runStepThinkTime(step *TStep, ttc *ThinkTimeConfig) (stepResult *stepData, err error) {
+	thinkTime := step.ThinkTime
+	log.Info().
+		Str("name", step.Name).
+		Float64("time", thinkTime.Time).
+		Msg("think time")
+	stepResult = &stepData{
+		Name:     step.Name,
+		StepType: stepTypeThinkTime,
+		Success:  true,
+	}
+	if ttc == nil {
+		ttc = &ThinkTimeConfig{thinkTimeDefault, nil, 0}
+	}
+	var tt time.Duration
+	switch ttc.Strategy {
+	case thinkTimeDefault:
+		tt = time.Duration(thinkTime.Time*1000) * time.Millisecond
+	case thinkTimeRandomPercentage:
+		m, ok := ttc.Setting.(map[string]float64) // e.g. {"min_percentage": 0.5, "max_percentage": 1.5}
+		if !ok {
+			tt = time.Duration(thinkTime.Time*1000) * time.Millisecond
+			break
+		}
+		res := builtin.GetRandomNumber(int(thinkTime.Time*m["min_percentage"]*1000), int(thinkTime.Time*m["max_percentage"]*1000))
+		tt = time.Duration(res) * time.Millisecond
+	case thinkTimeMultiply:
+		value, ok := ttc.Setting.(float64) // e.g. 0.5
+		if !ok || value <= 0 {
+			value = thinkTimeDefaultMultiply
+		}
+		tt = time.Duration(thinkTime.Time*value*1000) * time.Millisecond
+	case thinkTimeIgnore:
+		// nothing to do
+	}
+	// no more than limit
+	if ttc.Limit > 0 {
+		limit := time.Duration(ttc.Limit*1000) * time.Millisecond
+		if limit < tt {
+			tt = limit
+		}
+	}
+	time.Sleep(tt)
+	return stepResult, nil
+}
+
 func (r *caseRunner) runStepTransaction(transaction *Transaction) (stepResult *stepData, err error) {
 	log.Info().
 		Str("name", transaction.Name).
@@ -966,6 +1015,9 @@ func (r *caseRunner) parseConfig(cfg *TConfig) error {
 	}
 	cfg.BaseURL = convertString(parsedBaseURL)
 
+	// ensure correction of think time config
+	cfg.ThinkTime.checkThinkTime()
+
 	return nil
 }
 
diff --git a/runner_test.go b/runner_test.go
index 032c3f64..8f3dcc8b 100644
--- a/runner_test.go
+++ b/runner_test.go
@@ -5,6 +5,7 @@ import (
 	"os"
 	"os/exec"
 	"testing"
+	"time"
 
 	"github.com/rs/zerolog/log"
 )
@@ -146,6 +147,63 @@ func TestInitRendezvous(t *testing.T) {
 	}
 }
 
+func TestThinkTime(t *testing.T) {
+	buildHashicorpPlugin()
+	defer removeHashicorpPlugin()
+
+	testcases := []*TestCase{
+		{
+			Config: NewConfig("TestCase1"),
+			TestSteps: []IStep{
+				NewStep("thinkTime").SetThinkTime(2),
+			},
+		},
+		{
+			Config: NewConfig("TestCase2").
+				SetThinkTime(thinkTimeIgnore, nil, 0),
+			TestSteps: []IStep{
+				NewStep("thinkTime").SetThinkTime(0.5),
+			},
+		},
+		{
+			Config: NewConfig("TestCase3").
+				SetThinkTime(thinkTimeRandomPercentage, nil, 0),
+			TestSteps: []IStep{
+				NewStep("thinkTime").SetThinkTime(1),
+			},
+		},
+		{
+			Config: NewConfig("TestCase4").
+				SetThinkTime(thinkTimeRandomPercentage, map[string]interface{}{"min_percentage": 2, "max_percentage": 3}, 2.5),
+			TestSteps: []IStep{
+				NewStep("thinkTime").SetThinkTime(1),
+			},
+		},
+		{
+			Config: NewConfig("TestCase5"),
+			TestSteps: []IStep{
+				NewStep("thinkTime").CallRefCase(&demoThinkTimeJsonPath), // think time: 3s, random pct: {"min_percentage":1, "max_percentage":1.5}, limit: 4s
+			},
+		},
+	}
+	expectedMinValue := []float64{2, 0, 0.5, 2, 3}
+	expectedMaxValue := []float64{2.5, 0.5, 2, 3, 10}
+	for idx, testcase := range testcases {
+		r := NewRunner(t)
+		startTime := time.Now()
+		err := r.Run(testcase)
+		if err != nil {
+			t.Fatalf("run testcase error: %v", err)
+		}
+		duration := time.Since(startTime)
+		minValue := time.Duration(expectedMinValue[idx]*1000) * time.Millisecond
+		maxValue := time.Duration(expectedMaxValue[idx]*1000) * time.Millisecond
+		if duration < minValue || duration > maxValue {
+			t.Fatalf("failed to test think time, expect value: [%v, %v], actual value: %v", minValue, maxValue, duration)
+		}
+	}
+}
+
 func TestGenHTMLReport(t *testing.T) {
 	summary := newOutSummary()
 	caseSummary1 := newSummary()
diff --git a/step.go b/step.go
index 570120a1..829e9aad 100644
--- a/step.go
+++ b/step.go
@@ -40,6 +40,12 @@ func (c *TConfig) WithParameters(parameters map[string]interface{}) *TConfig {
 	return c
 }
 
+// SetThinkTime sets think time config for current testcase.
+func (c *TConfig) SetThinkTime(strategy string, cfg interface{}, limit float64) *TConfig {
+	c.ThinkTime = &ThinkTimeConfig{strategy, cfg, limit}
+	return c
+}
+
 // ExportVars specifies variable names to export for current testcase.
 func (c *TConfig) ExportVars(vars ...string) *TConfig {
 	c.Export = vars
@@ -193,6 +199,16 @@ func (s *StepRequest) EndTransaction(name string) *StepTransaction {
 	}
 }
 
+// SetThinkTime sets think time.
+func (s *StepRequest) SetThinkTime(time float64) *StepThinkTime {
+	s.step.ThinkTime = &ThinkTime{
+		Time: time,
+	}
+	return &StepThinkTime{
+		step: s.step,
+	}
+}
+
 // StepRequestWithOptionalArgs implements IStep interface.
 type StepRequestWithOptionalArgs struct {
 	step *TStep
@@ -355,6 +371,23 @@ func (s *StepTestCaseWithOptionalArgs) ToStruct() *TStep {
 	return s.step
 }
 
+// StepThinkTime implements IStep interface.
+type StepThinkTime struct {
+	step *TStep
+}
+
+func (s *StepThinkTime) Name() string {
+	return s.step.Name
+}
+
+func (s *StepThinkTime) Type() string {
+	return "thinktime"
+}
+
+func (s *StepThinkTime) ToStruct() *TStep {
+	return s.step
+}
+
 // StepTransaction implements IStep interface.
 type StepTransaction struct {
 	step *TStep