sincerity is one of the important category in our traditional moral systems,and it is the main character of the modern social ethics too.It has a very important position and function in modern society.University student's sincerity is the barometer and wind vane of the whole society.This article does overall exposition to the intension of sincerity,the lack of the university student's sincerity and the analysis of it's reason and the strengthening of the university student's sincerity.We should strengthen the sincerity construction of university students,improve university student's own sincerity levels and develop a good social sincerity morals environment further.