diff --git a/os/gcmd/gcmd_command.go b/os/gcmd/gcmd_command.go
index 50ac66b98..a7d018786 100644
--- a/os/gcmd/gcmd_command.go
+++ b/os/gcmd/gcmd_command.go
@@ -10,6 +10,7 @@ package gcmd
 import (
 	"context"
 
+	"github.com/gogf/gf/v2/container/gset"
 	"github.com/gogf/gf/v2/errors/gerror"
 	"github.com/gogf/gf/v2/text/gstr"
 )
@@ -70,16 +71,35 @@ func CommandFromCtx(ctx context.Context) *Command {
 // AddCommand adds one or more sub-commands to current command.
 func (c *Command) AddCommand(commands ...*Command) error {
 	for _, cmd := range commands {
-		cmd.Name = gstr.Trim(cmd.Name)
-		if cmd.Name == "" {
-			return gerror.New("command name should not be empty")
+		if err := c.doAddCommand(cmd); err != nil {
+			return err
 		}
-		cmd.parent = c
-		c.commands = append(c.commands, cmd)
 	}
 	return nil
 }
 
+// doAddCommand adds one sub-command to current command.
+func (c *Command) doAddCommand(command *Command) error {
+	command.Name = gstr.Trim(command.Name)
+	if command.Name == "" {
+		return gerror.New("command name should not be empty")
+	}
+	// Repeated check.
+	var (
+		commandNameSet = gset.NewStrSet()
+	)
+	for _, cmd := range c.commands {
+		commandNameSet.Add(cmd.Name)
+	}
+	if commandNameSet.Contains(command.Name) {
+		return gerror.Newf(`command "%s" is already added to command "%s"`, command.Name, c.Name)
+	}
+	// Add the given command to its sub-commands array.
+	command.parent = c
+	c.commands = append(c.commands, command)
+	return nil
+}
+
 // AddObject adds one or more sub-commands to current command using struct object.
 func (c *Command) AddObject(objects ...interface{}) error {
 	var (
diff --git a/os/gcmd/gcmd_command_object.go b/os/gcmd/gcmd_command_object.go
index da33741f5..9308bf8d7 100644
--- a/os/gcmd/gcmd_command_object.go
+++ b/os/gcmd/gcmd_command_object.go
@@ -308,7 +308,9 @@ func newCommandFromMethod(object interface{}, method reflect.Value) (command *Co
 
 func newArgumentsFromInput(object interface{}) (args []Argument, err error) {
 	var (
-		fields []gstructs.Field
+		fields   []gstructs.Field
+		nameSet  = gset.NewStrSet()
+		shortSet = gset.NewStrSet()
 	)
 	fields, err = gstructs.Fields(gstructs.FieldsInput{
 		Pointer:         object,
@@ -340,8 +342,27 @@ func newArgumentsFromInput(object interface{}) (args []Argument, err error) {
 		if v, ok := metaData[tagNameArg]; ok {
 			arg.IsArg = gconv.Bool(v)
 		}
+		if nameSet.Contains(arg.Name) {
+			return nil, gerror.Newf(
+				`argument name "%s" defined in "%s.%s" is already token by other argument`,
+				arg.Name, reflect.TypeOf(object).String(), field.Name(),
+			)
+		}
+		nameSet.Add(arg.Name)
+
+		if arg.Short != "" {
+			if shortSet.Contains(arg.Short) {
+				return nil, gerror.Newf(
+					`short argument name "%s" defined in "%s.%s" is already token by other argument`,
+					arg.Short, reflect.TypeOf(object).String(), field.Name(),
+				)
+			}
+			shortSet.Add(arg.Short)
+		}
+
 		args = append(args, arg)
 	}
+
 	return
 }