When the probation period expires, both parties continue to maintain the labor relationship, it is deemed that they have become regular employees. Probation period refers to the period during which the employer inspects whether the employee meets the employment conditions and the employee inspects whether the employer is suitable for himself. After the probationary period expires, the employer has the right to decide who needs to sign when going through the formalities of becoming a regular employee. However, upon the expiration of the probationary period, both parties shall continue to maintain the labor relationship, regardless of whether they have gone through the formalities for becoming a regular employee or not, and shall be deemed to have become a regular employee. Article 19 of the Labor Contract Law, if the term of a labor contract is more than three months but less than one year, the probation period shall not exceed one month; If the term of the labor contract is more than one year but less than three years, the probation period shall not exceed two months; The probation period of a labor contract with or without a fixed term of more than three years shall not exceed six months. The same employer and the same worker can only agree on one probation period. A probation period may not be stipulated in a labor contract whose term is to complete a certain task or whose term is less than three months. The probation period is included in the term of the labor contract. If the labor contract only stipulates a probation period, the probation period shall not be established, and this period shall be the term of the labor contract.