Hong Kong people work in Shenzhen, how to buy social security and calculation methods?

Your social security contributions and required materials are no different from those of mainland employees. Specific: the payment base is your average monthly salary in the previous year. If you are new here, take your salary in the last month as the payment base; Payment ratio, unit 20%, your personal 8%. What materials are needed? Your company handles them. Generally, a copy of ID card and employee resume are required.