diff --git a/convert.go b/convert.go
index ba3b8d15..3d9880eb 100644
--- a/convert.go
+++ b/convert.go
@@ -96,7 +96,7 @@ func loadFromYAML(path string) (*TCase, error) {
 	return tc, err
 }
 
-func loadFromCSV(path string) []map[string]string {
+func LoadFromCSV(path string) []map[string]string {
 	path, err := filepath.Abs(path)
 	if err != nil {
 		log.Error().Str("path", path).Err(err).Msg("convert absolute path failed")
diff --git a/internal/builtin/function.go b/internal/builtin/function.go
index 2384d654..be7c129e 100644
--- a/internal/builtin/function.go
+++ b/internal/builtin/function.go
@@ -3,6 +3,7 @@ package builtin
 import (
 	"crypto/md5"
 	"encoding/hex"
+	"github.com/httprunner/hrp"
 	"math"
 	"math/rand"
 	"time"
@@ -14,7 +15,8 @@ var Functions = map[string]interface{}{
 	"gen_random_string": genRandomString, // call with one argument
 	"max":               math.Max,        // call with two arguments
 	"md5":               MD5,
-	"getAppVersion":     getAppVersion, // test
+	"parameterize":      hrp.LoadFromCSV,
+	"P":                 hrp.LoadFromCSV,
 }
 
 func init() {
@@ -45,7 +47,3 @@ func MD5(str string) string {
 	hasher.Write([]byte(str))
 	return hex.EncodeToString(hasher.Sum(nil))
 }
-
-func getAppVersion() []float64 {
-	return []float64{3.1, 3.3}
-}
diff --git a/parser.go b/parser.go
index e95946c8..1c836f36 100644
--- a/parser.go
+++ b/parser.go
@@ -259,25 +259,13 @@ func contains(s []string, e string) bool {
 	return false
 }
 
-func getMappingFunction(funcName string) (interface{}, error) {
-	if function, ok := builtin.Functions[funcName]; ok {
-		// function is builtin
-		return function, nil
-	} else if contains([]string{"parameterize", "P"}, funcName) {
-		// parameterize function
-		return loadFromCSV, nil
-	} else {
-		// function not found
-		return nil, fmt.Errorf("function %s is not found", funcName)
-	}
-}
-
 // callFunc call function with arguments
 // only support return at most one result value
 func callFunc(funcName string, arguments ...interface{}) (interface{}, error) {
-	function, err := getMappingFunction(funcName)
-	if err != nil {
-		return nil, err
+	function, ok := builtin.Functions[funcName]
+	if !ok {
+		// function not found
+		return nil, fmt.Errorf("function %s is not found", funcName)
 	}
 	funcValue := reflect.ValueOf(function)
 	if funcValue.Kind() != reflect.Func {