diff --git a/examples/extract_test.go b/examples/extract_test.go
index 1fb1df8c..6f5d5dc2 100644
--- a/examples/extract_test.go
+++ b/examples/extract_test.go
@@ -6,7 +6,8 @@ import (
 	"github.com/httprunner/httpboomer"
 )
 
-func TestCaseExtractStep(t *testing.T) {
+// reference extracted variables for validation in the same step
+func TestCaseExtractStepSingle(t *testing.T) {
 	testcase := &httpboomer.TestCase{
 		Config: httpboomer.TConfig{
 			Name:    "run request with variables",
@@ -28,10 +29,9 @@ func TestCaseExtractStep(t *testing.T) {
 				WithJmesPath("headers.\"Content-Type\"", "contentType").
 				WithJmesPath("body.args.foo1", "varFoo1").
 				Validate().
-				AssertEqual("$statusCode", "$expectedStatusCode", "check status code"). // assert with extracted variable
-				AssertEqual("headers.Connection", "keep-alive", "check header Connection").
-				AssertEqual("$contentType", "application/json; charset=utf-8", "check header Content-Type"). // assert with extracted variable
-				AssertEqual("$varFoo1", "bar1", "check args foo1").                                          // assert with extracted variable
+				AssertEqual("$statusCode", "$expectedStatusCode", "check status code").                      // assert with extracted variable from current step
+				AssertEqual("$contentType", "application/json; charset=utf-8", "check header Content-Type"). // assert with extracted variable from current step
+				AssertEqual("$varFoo1", "bar1", "check args foo1").                                          // assert with extracted variable from current step
 				AssertEqual("body.args.foo2", "bar2", "check args foo2").
 				AssertEqual("body.headers.\"user-agent\"", "HttpBoomer", "check header user agent"),
 		},
@@ -42,3 +42,48 @@ func TestCaseExtractStep(t *testing.T) {
 		t.Fatalf("run testcase error: %v", err)
 	}
 }
+
+// reference extracted variables from previous step
+func TestCaseExtractStepAssociation(t *testing.T) {
+	testcase := &httpboomer.TestCase{
+		Config: httpboomer.TConfig{
+			Name:    "run request with variables",
+			BaseURL: "https://postman-echo.com",
+			Verify:  false,
+		},
+		TestSteps: []httpboomer.IStep{
+			httpboomer.Step("get with params").
+				WithVariables(map[string]interface{}{
+					"var1":  "bar1",
+					"agent": "HttpBoomer",
+				}).
+				GET("/get").
+				WithParams(map[string]interface{}{"foo1": "$var1", "foo2": "bar2"}).
+				WithHeaders(map[string]string{"User-Agent": "$agent"}).
+				Extract().
+				WithJmesPath("status_code", "statusCode").
+				WithJmesPath("headers.\"Content-Type\"", "contentType").
+				WithJmesPath("body.args.foo1", "varFoo1").
+				Validate().
+				AssertEqual("$statusCode", 200, "check status code").
+				AssertEqual("headers.Connection", "keep-alive", "check header Connection").
+				AssertEqual("$contentType", "application/json; charset=utf-8", "check header Content-Type").
+				AssertEqual("$varFoo1", "bar1", "check args foo1").
+				AssertEqual("body.args.foo2", "bar2", "check args foo2").
+				AssertEqual("body.headers.\"user-agent\"", "HttpBoomer", "check header user agent"),
+			httpboomer.Step("post json data").
+				POST("/post").
+				WithHeaders(map[string]string{"User-Agent": "HttpBoomer"}).
+				WithJSON(map[string]interface{}{"foo1": "bar1", "foo2": "bar2"}).
+				Validate().
+				AssertEqual("status_code", "$statusCode", "check status code"). // assert with extracted variable from previous step
+				AssertEqual("$varFoo1", "bar1", "check json foo1").             // assert with extracted variable from previous step
+				AssertEqual("body.json.foo2", "bar2", "check json foo2"),
+		},
+	}
+
+	err := httpboomer.Test(t, testcase)
+	if err != nil {
+		t.Fatalf("run testcase error: %v", err)
+	}
+}
diff --git a/response.go b/response.go
index a61abc92..816246ad 100644
--- a/response.go
+++ b/response.go
@@ -89,7 +89,8 @@ func (v *ResponseObject) Extract(extractors map[string]string) map[string]interf
 	extractMapping := make(map[string]interface{})
 	for key, value := range extractors {
 		extractedValue := v.searchJmespath(value)
-		log.Printf("extract %s => %v", value, extractedValue)
+		log.Printf("[extract] %s => %v", value, extractedValue)
+		log.Printf("[setVariable] %s = %v", key, extractedValue)
 		extractMapping[key] = extractedValue
 	}
 
@@ -117,7 +118,7 @@ func (v *ResponseObject) Validate(validators []TValidator, variablesMapping map[
 
 		// do assertion
 		result := assertFunc(v.t, expectValue, checkValue)
-		log.Printf("assert %s %s %v => %v", checkItem, assertMethod, expectValue, result)
+		log.Printf("[assert] %s <%s> %v => %v", checkItem, assertMethod, expectValue, result)
 		if !result {
 			v.t.Fail()
 		}