diff --git a/format/document.go b/format/document.go
index 59fff28..276121c 100644
--- a/format/document.go
+++ b/format/document.go
@@ -78,7 +78,7 @@ func FormatDocumentWithValidation(doc *parser.Document, selfValidation bool) (st
 		psr := parser.PEGParser{}
 		formattedAst, err := psr.Parse("formated.thrift", []byte(res))
 		if err != nil {
-			return "", fmt.Errorf("format error: format result failed to parse. Please report bug to author at https://github.com/joyme123/thrift-ls/issues")
+			return "", fmt.Errorf("format error: format result failed to parse, error msg: %v. Please report bug to author at https://github.com/joyme123/thrift-ls/issues", err)
 		}
 
 		if !doc.Equals(formattedAst) {
diff --git a/format/document_test.go b/format/document_test.go
index 5be9c99..28ab061 100644
--- a/format/document_test.go
+++ b/format/document_test.go
@@ -7,6 +7,70 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func Test_FormatDocumentServiceCommaOptions(t *testing.T) {
+	doc := `
+service A {
+    bool func1()
+
+    bool func2();
+}`
+
+	// add comma
+	expectedDoc := `service A {
+    bool func1(),
+
+    bool func2(),
+}`
+
+	FieldLineComma = FieldLineCommaAdd
+
+	ast, err := parser.Parse("test.thrift", []byte(doc))
+	assert.NoError(t, err)
+	assert.NotNil(t, ast)
+
+	formated, err := FormatDocument(ast.(*parser.Document))
+	assert.Equal(t, expectedDoc, formated)
+
+	_, err = FormatDocumentWithValidation(ast.(*parser.Document), true)
+	assert.NoError(t, err)
+
+	// remove comma
+	expectedDoc = `service A {
+    bool func1()
+
+    bool func2()
+}`
+	FieldLineComma = FieldLineCommaRemove
+
+	ast, err = parser.Parse("test.thrift", []byte(doc))
+	assert.NoError(t, err)
+	assert.NotNil(t, ast)
+
+	formated, err = FormatDocument(ast.(*parser.Document))
+	assert.Equal(t, expectedDoc, formated)
+
+	_, err = FormatDocumentWithValidation(ast.(*parser.Document), true)
+	assert.NoError(t, err)
+
+	// disable
+	expectedDoc = `service A {
+    bool func1()
+
+    bool func2();
+}`
+	FieldLineComma = FieldLineCommaDisable
+
+	ast, err = parser.Parse("test.thrift", []byte(doc))
+	assert.NoError(t, err)
+	assert.NotNil(t, ast)
+
+	formated, err = FormatDocument(ast.(*parser.Document))
+	assert.Equal(t, expectedDoc, formated)
+
+	_, err = FormatDocumentWithValidation(ast.(*parser.Document), true)
+	assert.NoError(t, err)
+}
+
 func Test_FormatDocument(t *testing.T) {
 	ast, err := parser.Parse("test.thrift", []byte(ThriftTestContent))
 	assert.NoError(t, err)
diff --git a/format/function.go b/format/function.go
index 7920a80..2005bd0 100644
--- a/format/function.go
+++ b/format/function.go
@@ -67,9 +67,14 @@ func MustFormatFunction(fn *parser.Function, indent string) string {
 	}
 
 	sep := ""
-	if fn.ListSeparatorKeyword != nil {
-		sep = MustFormatKeyword(fn.ListSeparatorKeyword.Keyword)
-	}
+
+	if FieldLineComma == FieldLineCommaAdd { // add comma always
+		sep = ","
+	} else if FieldLineComma == FieldLineCommaDisable { // add list separator
+		if fn.ListSeparatorKeyword != nil {
+			sep = MustFormatKeyword(fn.ListSeparatorKeyword.Keyword)
+		}
+	} // otherwise, sep will be removed
 
 	throws := MustFormatThrows(fn.Throws)
 	if fn.Throws != nil {
diff --git a/parser/ast.go b/parser/ast.go
index 9b34417..1f640e8 100644
--- a/parser/ast.go
+++ b/parser/ast.go
@@ -2362,9 +2362,10 @@ func (f *Function) Equals(node Node) bool {
 		return false
 	}
 
-	if !f.ListSeparatorKeyword.Equals(fn.ListSeparatorKeyword) {
-		return false
-	}
+	// 格式化场景，会变更默认的分隔符，所以在  equals 时不需要比较
+	// if !f.ListSeparatorKeyword.Equals(fn.ListSeparatorKeyword) {
+	// return false
+	// }
 
 	if !f.Name.Equals(fn.Name) {
 		return false