What should I do if Dalian social security has been paid for many years?

You can choose to make up. According to the Notice on Issues Related to Employees' Payment of Basic Old-age Insurance, if the insured fails to pay the old-age insurance premium or the payment is interrupted for various reasons, he can apply for payment within the working age stipulated by the state (male: less than 60 years old, female: less than 50 years old, except those who have received old-age insurance benefits).