diff --git a/encoding/gjson/gjson_z_unit_feature_set_test.go b/encoding/gjson/gjson_z_unit_feature_set_test.go
index 1685e816f..49474fed9 100644
--- a/encoding/gjson/gjson_z_unit_feature_set_test.go
+++ b/encoding/gjson/gjson_z_unit_feature_set_test.go
@@ -8,6 +8,8 @@ package gjson_test
 
 import (
 	"bytes"
+	"encoding/json"
+	"fmt"
 	"testing"
 
 	"github.com/gogf/gf/v2/container/garray"
@@ -347,3 +349,31 @@ func Test_Set_WithEmptyStruct(t *testing.T) {
 		t.Assert(j.MustToJsonString(), `{"aa":"123"}`)
 	})
 }
+
+// Issue3108String
+type Issue3108String struct {
+	Name string
+}
+
+func (i Issue3108String) MarshalJSON() ([]byte, error) {
+	return []byte(fmt.Sprintf(`"[%s]"`, i.Name)), nil
+}
+
+func Test_Issue3108(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		type Issue3108 struct {
+			MyName Issue3108String `json:"my_name"`
+		}
+		obj := &Issue3108{MyName: Issue3108String{Name: "test"}}
+
+		b, err := json.Marshal(obj)
+		t.AssertNil(err)
+		t.Log(string(b))
+		t.Assert(string(b), `{"my_name":"[test]"}`)
+
+		j := gjson.New(obj)
+		jb, err := j.ToJson()
+		t.AssertNil(err)
+		t.Assert(string(jb), `{"my_name":"[test]"}`)
+	})
+}
diff --git a/util/gconv/gconv_map.go b/util/gconv/gconv_map.go
index f9a510eec..6a74664e1 100644
--- a/util/gconv/gconv_map.go
+++ b/util/gconv/gconv_map.go
@@ -7,6 +7,7 @@
 package gconv
 
 import (
+	. "encoding/json"
 	"reflect"
 	"strings"
 
@@ -380,6 +381,12 @@ func doMapConvertForMapOrStructValue(in doMapConvertForMapOrStructValueInput) in
 						// as it might be changed from pointer to struct.
 						rvInterface = rvField.Interface()
 					)
+
+					if _, ok := rvField.Interface().(Marshaler); ok {
+						dataMap[mapKey] = rvField.Interface()
+						return dataMap
+					}
+
 					switch {
 					case hasNoTag && rtField.Anonymous:
 						// It means this attribute field has no tag.
diff --git a/util/gconv/gconv_z_unit_map_test.go b/util/gconv/gconv_z_unit_map_test.go
index 9dca4ce39..376a133e3 100644
--- a/util/gconv/gconv_z_unit_map_test.go
+++ b/util/gconv/gconv_z_unit_map_test.go
@@ -8,6 +8,7 @@ package gconv_test
 
 import (
 	"encoding/json"
+	"fmt"
 	"testing"
 
 	"gopkg.in/yaml.v3"
@@ -620,3 +621,27 @@ func TestMapWithJsonOmitEmpty(t *testing.T) {
 		t.Assert(gconv.Map(s), g.Map{"Value": 1})
 	})
 }
+
+// Issue3108String
+type Issue3108String struct {
+	Name string
+}
+
+func (i Issue3108String) MarshalJSON() ([]byte, error) {
+	return []byte(fmt.Sprintf(`"[%s]"`, i.Name)), nil
+}
+
+func Test_Issue3108(t *testing.T) {
+	gtest.C(t, func(t *gtest.T) {
+		type Issue3108 struct {
+			MyName Issue3108String `json:"my_name"`
+		}
+		obj := &Issue3108{MyName: Issue3108String{Name: "test"}}
+
+		converted := gconv.MapDeep(obj)
+		jsonData, err := json.Marshal(converted)
+
+		t.AssertNil(err)
+		t.Assert(string(jsonData), `{"my_name":"[test]"}`)
+	})
+}