unbindTagsArgs := &UnbindTagsArgs{ 
    // Set the tag you want to unbind 
    ChangeTags: []model.TagModel{ 
        { 
            TagKey:   "tag1", 
            TagValue: "var1", 
        }, 
    }, 
} 
// Set the instanceId you want to operate 
instanceId := "your-choose-instance-id" 
if err := BBC_CLIENT.UnbindTags(instanceId, unbindTagsArgs); err != nil { 
    fmt.Println("unbind instance tags failed: ", err) 
} else { 
    fmt.Println("unbind instance tags success.") 
}