diff --git a/docs/cmd/hrp_har2case.md b/docs/cmd/hrp_har2case.md
index d203c699..667710f7 100644
--- a/docs/cmd/hrp_har2case.md
+++ b/docs/cmd/hrp_har2case.md
@@ -7,15 +7,16 @@ Convert HAR to json/yaml testcase files
 Convert HAR to json/yaml testcase files
 
 ```
-hrp har2case path... [flags]
+hrp har2case harPath... [flags]
 ```
 
 ### Options
 
 ```
-  -h, --help      help for har2case
-  -j, --to-json   convert to JSON format (default)
-  -y, --to-yaml   convert to JSON format
+  -h, --help                help for har2case
+  -d, --output-dir string   specify output directory, default to the same dir with har file
+  -j, --to-json             convert to JSON format (default)
+  -y, --to-yaml             convert to JSON format
 ```
 
 ### SEE ALSO
diff --git a/har2case/core.go b/har2case/core.go
index f87fc152..0db841c2 100644
--- a/har2case/core.go
+++ b/har2case/core.go
@@ -16,6 +16,11 @@ import (
 	"github.com/httprunner/hrp"
 )
 
+const (
+	suffixJSON = ".json"
+	suffixYAML = ".yaml"
+)
+
 func NewHAR(path string) *HAR {
 	return &HAR{
 		path: path,
@@ -34,33 +39,21 @@ func (h *HAR) SetOutputDir(dir string) {
 }
 
 func (h *HAR) GenJSON() (jsonPath string, err error) {
-	jsonFile := getFilenameWithoutExtension(h.path) + ".json"
-	if h.outputDir != "" {
-		jsonPath = filepath.Join(h.outputDir, jsonFile)
-	} else {
-		jsonPath = filepath.Join(filepath.Dir(h.path), jsonFile)
-	}
-
 	tCase, err := h.makeTestCase()
 	if err != nil {
 		return "", err
 	}
+	jsonPath = h.genOutputPath(suffixJSON)
 	err = tCase.Dump2JSON(jsonPath)
 	return
 }
 
 func (h *HAR) GenYAML() (yamlPath string, err error) {
-	yamlFile := getFilenameWithoutExtension(h.path) + ".yaml"
-	if h.outputDir != "" {
-		yamlPath = filepath.Join(h.outputDir, yamlFile)
-	} else {
-		yamlPath = filepath.Join(filepath.Dir(h.path), yamlFile)
-	}
-
 	tCase, err := h.makeTestCase()
 	if err != nil {
 		return "", err
 	}
+	yamlPath = h.genOutputPath(suffixYAML)
 	err = tCase.Dump2YAML(yamlPath)
 	return
 }
@@ -306,6 +299,15 @@ func (s *TStep) makeValidate(entry *Entry) error {
 	return nil
 }
 
+func (h *HAR) genOutputPath(suffix string) string {
+	file := getFilenameWithoutExtension(h.path) + suffix
+	if h.outputDir != "" {
+		return filepath.Join(h.outputDir, file)
+	} else {
+		return filepath.Join(filepath.Dir(h.path), file)
+	}
+}
+
 func getFilenameWithoutExtension(path string) string {
 	base := filepath.Base(path)
 	ext := filepath.Ext(base)