Shanghai social security has been paid continuously for 5 years.

Increase the number of years for non-local residents to pay personal income tax or social insurance when buying a house. (Accumulated payment for more than 2 years in this city within the first three years from the date of purchase, and adjusted to continuous payment for 5 years or more before the date of purchase; Commercial housing purchased by enterprises needs to be listed and traded for 3 years or more. )shzyqiyu88

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