diff --git a/maputil/convert.go b/maputil/convert.go
index 0c637f49b..24b49fca3 100644
--- a/maputil/convert.go
+++ b/maputil/convert.go
@@ -21,12 +21,11 @@ func KeyToLower(src map[string]string) map[string]string {
 
 // ToStringMap convert map[string]any to map[string]string
 func ToStringMap(src map[string]any) map[string]string {
-	newMp := make(map[string]string, len(src))
+	strMp := make(map[string]string, len(src))
 	for k, v := range src {
-		newMp[k] = strutil.MustString(v)
+		strMp[k] = strutil.MustString(v)
 	}
-
-	return newMp
+	return strMp
 }
 
 // CombineToSMap combine two string-slice to SMap(map[string]string)
diff --git a/maputil/data.go b/maputil/data.go
index 0b0949f54..fad2f14fb 100644
--- a/maputil/data.go
+++ b/maputil/data.go
@@ -148,14 +148,15 @@ func (d Data) Bool(key string) bool {
 	if !ok {
 		return false
 	}
-	if bl, ok := val.(bool); ok {
-		return bl
-	}
 
-	if str, ok := val.(string); ok {
-		return strutil.QuietBool(str)
+	switch tv := val.(type) {
+	case string:
+		return strutil.QuietBool(tv)
+	case bool:
+		return tv
+	default:
+		return false
 	}
-	return false
 }
 
 // Strings get []string value
@@ -193,6 +194,11 @@ func (d Data) StringsByStr(key string) []string {
 	return nil
 }
 
+// StrMap get map[string]string value
+func (d Data) StrMap(key string) map[string]string {
+	return d.StringMap(key)
+}
+
 // StringMap get map[string]string value
 func (d Data) StringMap(key string) map[string]string {
 	val, ok := d.GetByPath(key)
@@ -200,10 +206,14 @@ func (d Data) StringMap(key string) map[string]string {
 		return nil
 	}
 
-	if smp, ok := val.(map[string]string); ok {
-		return smp
+	switch tv := val.(type) {
+	case map[string]string:
+		return tv
+	case map[string]any:
+		return ToStringMap(tv)
+	default:
+		return nil
 	}
-	return nil
 }
 
 // Sub get sub value as new Data
diff --git a/maputil/data_test.go b/maputil/data_test.go
index f9b67ee29..87dc41ea1 100644
--- a/maputil/data_test.go
+++ b/maputil/data_test.go
@@ -11,11 +11,12 @@ import (
 
 func TestData_usage(t *testing.T) {
 	mp := maputil.Data{
-		"k1": 23,
-		"k2": "ab",
-		"k3": "true",
-		"k4": false,
-		"k5": map[string]string{"a": "b"},
+		"k1":    23,
+		"k2":    "ab",
+		"k3":    "true",
+		"k4":    false,
+		"k5":    map[string]string{"a": "b"},
+		"anyMp": map[string]any{"b": 23},
 	}
 
 	assert.True(t, mp.Has("k1"))
@@ -23,6 +24,8 @@ func TestData_usage(t *testing.T) {
 	assert.False(t, mp.Bool("k4"))
 	assert.False(t, mp.IsEmtpy())
 	assert.Eq(t, 23, mp.Get("k1"))
+	assert.Eq(t, "b", mp.Get("k5.a"))
+	assert.Eq(t, 23, mp.Get("anyMp.b"))
 
 	// int
 	assert.Eq(t, 23, mp.Int("k1"))
@@ -52,6 +55,7 @@ func TestData_usage(t *testing.T) {
 
 	assert.Nil(t, mp.StringMap("notExists"))
 	assert.Eq(t, map[string]string{"a": "b"}, mp.StringMap("k5"))
+	assert.Eq(t, map[string]string{"b": "23"}, mp.StringMap("anyMp"))
 }
 
 func TestData_SetByPath(t *testing.T) {
@@ -60,6 +64,8 @@ func TestData_SetByPath(t *testing.T) {
 		"k5": map[string]any{"a": "v0"},
 	}
 	assert.Nil(t, mp.Get("k5.b"))
+	assert.Len(t, mp.Keys(), 2)
+	assert.NotEmpty(t, mp.ToStringMap())
 
 	err := mp.SetByPath("k5.b", "v2")
 	assert.NoErr(t, err)
diff --git a/maputil/maputil.go b/maputil/maputil.go
index cd38198e1..7becfa7bf 100644
--- a/maputil/maputil.go
+++ b/maputil/maputil.go
@@ -23,7 +23,7 @@ func SimpleMerge(src, dst map[string]any) map[string]any {
 		return dst
 	}
 
-	if dst == nil {
+	if len(dst) == 0 {
 		return src
 	}
 
@@ -43,6 +43,13 @@ func MergeSMap(src, dst map[string]string, ignoreCase bool) map[string]string {
 
 // MergeStringMap simple merge two string map. merge src to dst map
 func MergeStringMap(src, dst map[string]string, ignoreCase bool) map[string]string {
+	if len(src) == 0 {
+		return dst
+	}
+	if len(dst) == 0 {
+		return src
+	}
+
 	for k, v := range src {
 		if ignoreCase {
 			k = strings.ToLower(k)