Of course, in order to speed up the collection of wages and facilitate the law enforcement by the labor inspection department, migrant workers' friends must pay more attention when they are working, and try to collect evidence that can prove that you are really working on the construction site. For example, when you are working, the employer will issue you identification documents such as work permit and pass, and the contractor will have work schedule, settlement form, budget form and salary form. When paying wages, these evidences are generally sealed by the employer or signed by the relevant person in charge. You'd better keep the original. If you don't have the original, you should try to make a copy.