diff --git a/README.MD b/README.MD
index c626ca8c7..f3230b1c2 100644
--- a/README.MD
+++ b/README.MD
@@ -5,7 +5,7 @@
 [![Go Doc](https://godoc.org/github.com/gogf/gf?status.svg)](https://godoc.org/github.com/gogf/gf)
 [![GoFrame CI](https://github.com/gogf/gf/actions/workflows/gf.yml/badge.svg)](https://github.com/gogf/gf/actions/workflows/gf.yml)
 [![Go Report](https://goreportcard.com/badge/github.com/gogf/gf?v=1)](https://goreportcard.com/report/github.com/gogf/gf)
-[![Code Coverage](https://codecov.io/gh/gogf/gf/branch/master/graph/badge.svg)](https://codecov.io/gh/gogf/gf/branch/master)
+[![Code Coverage](https://codecov.io/gh/gogf/gf/branch/master/graph/badge.svg)](https://codecov.io/gh/gogf/gf)
 [![Production Ready](https://img.shields.io/badge/production-ready-blue.svg)](https://github.com/gogf/gf)
 [![License](https://img.shields.io/github/license/gogf/gf.svg?style=flat)](https://github.com/gogf/gf)
 </div>
diff --git a/text/gstr/gstr_parse.go b/text/gstr/gstr_parse.go
index 2f5573c87..52878bc70 100644
--- a/text/gstr/gstr_parse.go
+++ b/text/gstr/gstr_parse.go
@@ -40,9 +40,11 @@ func Parse(s string) (result map[string]interface{}, err error) {
 			err = gerror.Wrapf(err, `url.QueryUnescape failed for string "%s"`, part[:pos])
 			return nil, err
 		}
-		for key[0] == ' ' {
+
+		for len(key) > 0 && key[0] == ' ' {
 			key = key[1:]
 		}
+
 		if key == "" || key[0] == '[' {
 			continue
 		}
@@ -129,7 +131,6 @@ func build(result map[string]interface{}, keys []string, value interface{}) erro
 		result[key] = append(children, value)
 		return nil
 	}
-
 	// The end is slice + map. like v[][a]
 	if keys[1] == "" && length > 2 && keys[2] != "" {
 		val, ok := result[key]
diff --git a/text/gstr/gstr_z_unit_parse_test.go b/text/gstr/gstr_z_unit_parse_test.go
index 9d4bd90cd..bc4d457e9 100644
--- a/text/gstr/gstr_z_unit_parse_test.go
+++ b/text/gstr/gstr_z_unit_parse_test.go
@@ -18,6 +18,74 @@ import (
 )
 
 func Test_Parse(t *testing.T) {
+	// cover test
+	gtest.C(t, func(t *gtest.T) {
+		// empty
+		m, err := gstr.Parse("")
+		t.AssertNil(err)
+		t.Assert(m, nil)
+		// invalid
+		m, err = gstr.Parse("a&b")
+		t.AssertNil(err)
+		t.Assert(m, make(map[string]interface{}))
+		// special key
+		m, err = gstr.Parse(" =1& b=2&   c =3")
+		t.AssertNil(err)
+		t.Assert(m, map[string]interface{}{"b": "2", "c_": "3"})
+		m, err = gstr.Parse("c[=3")
+		t.AssertNil(err)
+		t.Assert(m, map[string]interface{}{"c_": "3"})
+		m, err = gstr.Parse("v[a][a]a=m")
+		t.AssertNil(err)
+		t.Assert(m, g.Map{
+			"v": g.Map{
+				"a": g.Map{
+					"a": "m",
+				},
+			},
+		})
+		// v[][a]=m&v[][b]=b => map["v"]:[{"a":"m","b":"b"}]
+		m, err = gstr.Parse("v[][a]=m&v[][b]=b")
+		t.AssertNil(err)
+		t.Assert(m, g.Map{
+			"v": g.Slice{
+				g.Map{
+					"a": "m",
+					"b": "b",
+				},
+			},
+		})
+		// v[][a]=m&v[][a]=b => map["v"]:[{"a":"m"},{"a":"b"}]
+		m, err = gstr.Parse("v[][a]=m&v[][a]=b")
+		t.AssertNil(err)
+		t.Assert(m, g.Map{
+			"v": g.Slice{
+				g.Map{
+					"a": "m",
+				},
+				g.Map{
+					"a": "b",
+				},
+			},
+		})
+		// error
+		m, err = gstr.Parse("v=111&v[]=m&v[]=a&v[]=b")
+		t.Log(err)
+		t.AssertNE(err, nil)
+		m, err = gstr.Parse("v=111&v[a]=m&v[a]=a")
+		t.Log(err)
+		t.AssertNE(err, nil)
+		_, err = gstr.Parse("%Q=%Q&b")
+		t.Log(err)
+		t.AssertNE(err, nil)
+		_, err = gstr.Parse("a=%Q&b")
+		t.Log(err)
+		t.AssertNE(err, nil)
+		_, err = gstr.Parse("v[a][a]=m&v[][a]=b")
+		t.Log(err)
+		t.AssertNE(err, nil)
+	})
+
 	// url
 	gtest.C(t, func(t *gtest.T) {
 		s := "goframe.org/index?name=john&score=100"