Can Ruian City in Wenzhou have a one-time relationship with social security?

You can't. According to Article 2 of "Several Provisions on the Implementation of Social Insurance Law of People's Republic of China (PRC)", when an individual participating in the basic old-age insurance for employees reaches the statutory retirement age, if the accumulated payment is less than fifteen years, the payment can be extended to fifteen years. After the implementation of the Social Insurance Law, if the payment is extended for five years but still less than fifteen years, it can be paid in one lump sum for fifteen years.