Basic pension = (the average monthly salary of employees in this province in the previous year when the insured retires+the average monthly payment salary of the insured) ÷2× payment period × 1%. During the employee's leave, the enterprise will pay his living expenses. Where retirement expenses have been co-ordinated, enterprises and retired workers shall pay the basic old-age insurance premiums in accordance with relevant regulations. When employees reach the retirement age stipulated by the state during retirement, they should go through retirement procedures according to regulations. Institutions can also handle internal retirement.