diff --git a/util/common/err.go b/util/common/err.go
index c0ecbbb8..f6078c33 100644
--- a/util/common/err.go
+++ b/util/common/err.go
@@ -6,8 +6,6 @@ import (
 	"x-ui/logger"
 )
 
-var CtxDone = errors.New("context done")
-
 func NewErrorf(format string, a ...interface{}) error {
 	msg := fmt.Sprintf(format, a...)
 	return errors.New(msg)
diff --git a/util/common/stringUtil.go b/util/common/stringUtil.go
deleted file mode 100644
index 5f1f93fd..00000000
--- a/util/common/stringUtil.go
+++ /dev/null
@@ -1,9 +0,0 @@
-package common
-
-import "sort"
-
-func IsSubString(target string, str_array []string) bool {
-	sort.Strings(str_array)
-	index := sort.SearchStrings(str_array, target)
-	return index < len(str_array) && str_array[index] == target
-}
diff --git a/util/context.go b/util/context.go
deleted file mode 100644
index b768f05c..00000000
--- a/util/context.go
+++ /dev/null
@@ -1,12 +0,0 @@
-package util
-
-import "context"
-
-func IsDone(ctx context.Context) bool {
-	select {
-	case <-ctx.Done():
-		return true
-	default:
-		return false
-	}
-}
diff --git a/util/json_util/json.go b/util/json_util/json.go
index 65ad789e..54e3728a 100644
--- a/util/json_util/json.go
+++ b/util/json_util/json.go
@@ -6,7 +6,7 @@ import (
 
 type RawMessage []byte
 
-// MarshalJSON 自定义 json.RawMessage 默认行为
+// MarshalJSON: Customize json.RawMessage default behavior
 func (m RawMessage) MarshalJSON() ([]byte, error) {
 	if len(m) == 0 {
 		return []byte("null"), nil
@@ -14,7 +14,7 @@ func (m RawMessage) MarshalJSON() ([]byte, error) {
 	return m, nil
 }
 
-// UnmarshalJSON sets *m to a copy of data.
+// UnmarshalJSON: sets *m to a copy of data.
 func (m *RawMessage) UnmarshalJSON(data []byte) error {
 	if m == nil {
 		return errors.New("json.RawMessage: UnmarshalJSON on nil pointer")
diff --git a/util/sys/a.s b/util/sys/a.s
deleted file mode 100644
index e69de29b..00000000