I just paid the employee medical insurance, but I didn't want to pay it immediately. Can I cancel the formalities?
 Yes, we should go through the cancellation procedures, taking Shanghai as an example. The Measures of Shanghai Municipality on Basic Medical Insurance for Employees has corresponding provisions: Article 6 The employing unit shall go through the registration formalities of basic medical insurance with the designated social insurance agency in accordance with the provisions of the Municipal Human Resources and Social Security Bureau. Among them, the newly established employers shall go through the registration procedures of basic medical insurance within 30 days from the date of establishment. If the employer terminates the registration of basic medical insurance according to law or changes the registration items, it shall go through the cancellation or change registration procedures with the original registration authority within 30 days from the date of the occurrence of the relevant circumstances. This is the relevant law about your problem.