Legal analysis: According to regulations, social security covers five insurances: pension, medical care, maternity, work injury and unemployment. The state stipulates that enterprises have the responsibility to deal with all of them. But in reality, there will be only 3-4 kinds of enterprises.

Legal basis: Article 2 of the Social Insurance Law of People's Republic of China (PRC) The state establishes social insurance systems such as basic old-age insurance, basic medical insurance, industrial injury insurance, unemployment insurance, maternity insurance, etc., to guarantee citizens' right to receive material assistance from the state and society in case of old age, illness, industrial injury, unemployment and maternity.