diff --git a/examples/parameters_test.yaml b/examples/parameters_test.yaml
index 412acaab..0eff1384 100644
--- a/examples/parameters_test.yaml
+++ b/examples/parameters_test.yaml
@@ -4,7 +4,7 @@ config:
     user_agent: [ "iOS/10.1", "iOS/10.2" ]
     username-password: ${parameterize(examples/account.csv)}
   parameters_setting:
-    strategy: ["random", "sequential"]
+    strategy: ""
     iteration: 10
   variables:
     app_version: v1
diff --git a/parser.go b/parser.go
index 0a337f37..0d5c70e6 100644
--- a/parser.go
+++ b/parser.go
@@ -613,16 +613,6 @@ func initParameterIterator(cfg *TConfig, mode string) (err error) {
 	}
 	rawValue := reflect.ValueOf(cfg.ParametersSetting.Strategy)
 	switch rawValue.Kind() {
-	case reflect.String:
-		if len(rawValue.String()) == 0 {
-			cfg.ParametersSetting.Strategy = strategySequential
-		} else {
-			cfg.ParametersSetting.Strategy = strings.ToLower(rawValue.String())
-		}
-		cfg.ParametersSetting.Iterator = append(
-			cfg.ParametersSetting.Iterator,
-			newIterator(genCartesianProduct(parameters), cfg.ParametersSetting.Strategy.(string), cfg.ParametersSetting.Iteration),
-		)
 	case reflect.Slice:
 		if len(parameters) != rawValue.Len() {
 			return errors.New("parameters and strategy should have the same length")
@@ -634,6 +624,22 @@ func initParameterIterator(cfg *TConfig, mode string) (err error) {
 				)
 			}
 		}
+	case reflect.String:
+		if len(rawValue.String()) == 0 {
+			cfg.ParametersSetting.Strategy = strategySequential
+		} else {
+			cfg.ParametersSetting.Strategy = strings.ToLower(rawValue.String())
+		}
+		cfg.ParametersSetting.Iterator = append(
+			cfg.ParametersSetting.Iterator,
+			newIterator(genCartesianProduct(parameters), cfg.ParametersSetting.Strategy.(string), cfg.ParametersSetting.Iteration),
+		)
+	default:
+		cfg.ParametersSetting.Strategy = strategySequential
+		cfg.ParametersSetting.Iterator = append(
+			cfg.ParametersSetting.Iterator,
+			newIterator(genCartesianProduct(parameters), cfg.ParametersSetting.Strategy.(string), cfg.ParametersSetting.Iteration),
+		)
 	}
 	return nil
 }