How to merge social security paid by different cities?

Legal analysis: 1. Take the proof materials to the social security agency to apply for a certificate: take the ID card and household registration book, and the proof materials to terminate the labor contract with the original unit, and apply to the local social security agency to issue the insurance certificate. 2. Apply to the social security agency in the new workplace for transferring the social security relationship: after the new unit takes office, the new unit will handle the social security relationship and pay the fees according to the regulations. When applying, you need to issue the insurance certificate of the original work unit and fill in the application form for renewal of insurance. 3. Audit of the new social security agency: The new social security agency examines whether the renewal application form meets the renewal conditions. If so, the new social security agency will send an admission notice to the social security agency in the original place of work. If not, the social security agency will explain the reasons and issue a written explanation. 4. Review of the original work unit: After receiving the admission notice, the original work unit will review the payment locally. If there is no arrears, transfer funds, and send the information form of pension insurance relationship transfer and connection to the social security institution where the new work unit is located, and terminate the social security relationship at the original work place. It is generally required to be completed within 15 working days. 5. After the approval, go through the connection formalities in the new social security agency: after receiving the connection information form, the new workplace will confirm that the funds have arrived, go through the connection formalities soon, and inform it to bring the required materials such as the insurance manual to the agency for confirmation.

Legal basis: Article 19 of the Social Insurance Law of People's Republic of China (PRC), if an individual is employed across the overall planning area, his basic old-age insurance relationship will be transferred accordingly, and the payment period will be calculated cumulatively. When an individual reaches the statutory retirement age, the basic pension is calculated in stages and distributed uniformly. Specific measures shall be formulated by the State Council.