Is there a conflict between school medical insurance and unit social security?

Sometimes they don't conflict, sometimes they do. Social security is generally paid by self-help or through the unit. Medical insurance is inpatient medical insurance that enrolls students through schools. Because medical insurance is a kind of social security, social security includes: pension, work injury, unemployment, maternity and medical care. If you are not in the same city, it is ok for you to participate at the same time. If you are in the same city, it is estimated that you cannot insure at the same time.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.