The medical insurance center handles it. According to the inquiry method, the employer shall apply to the social insurance agency for social insurance registration for its employees within 30 days from the date of employment. The insured person carries his valid certificate (ID card, household registration book, etc.). ) apply to the neighboring county medical insurance center, and the county medical insurance center will complete it on the spot. If the social insurance has not been registered, the social insurance agency shall verify the social insurance premium it should pay. Employees-free individual industrial and commercial households who voluntarily participate in social insurance, part-time employees who do not participate in social insurance in the employing unit and other flexible employees shall apply to the social insurance agency for social insurance registration, and the state shall establish a national unified personal social security number, and the personal social security number shall be the citizenship number.