1, Shanghai Workers' Security and Mutual Aid Association is a plan specially revised by Shanghai to further cooperate with the reform of the basic medical insurance system for urban workers in this city, carry forward the glorious tradition of unity, friendship and mutual assistance of the working class, and enable employees who are unfortunate enough to suffer from particularly serious diseases to receive effective treatment in time and recover as soon as possible. Shanghai Workers' Security Mutual Aid Association, the employer will not buy it for employees, but needs to buy it voluntarily for mutual assistance among employees.

2. Medical insurance refers to basic medical insurance, which is a social insurance system established to compensate workers for economic losses caused by disease risks. The medical insurance fund is established through the contributions of employers and individuals. After the insured person has medical expenses, the medical insurance institution will give certain economic compensation. Purchase is the employer's legal obligation.