A person working in three companies, on the one hand, shows that he is quite capable and competent, on the other hand, shows that he is full of energy and can finish his work well, which may also be due to life reasons. The law does not stipulate that a person cannot work in two companies. If an employee establishes a labor relationship with another company after working in one company, the employee cannot affect the work tasks of the previous company. The law does not stipulate that employees cannot work in two companies at the same time. But there are conditions for working at the same time, that is, the former unit must agree and the latter unit must know.