Social security can be adjusted several times a year.

Legal analysis: the base of medical insurance payment cannot be changed during the payment period, but the local social security bureau will adjust the base of social security payment once a year. After the adjustment takes effect, the medical insurance payment base can be changed once a year.

Legal basis: Article 24 of the Social Insurance Law of People's Republic of China (PRC) stipulates that the state shall establish and improve the new rural cooperative medical system. Measures for the administration of the new rural cooperative medical system shall be formulated by the State Council.