Liu Shao-qi was good at studying the theory of contradiction among the people.He not only paid attention to and raised the issue of contradiction among the early,but also brought forward a lot of original opinions.His main contributions are embodied in: putting forward the concept of internal contradiction among the people for the first time,opening the theory of two types of contradictions;explicitly pointing out that contradiction among the is the main contradiction in China;dissertating the main representation of contradiction among the and the causes of mass affairs;and explaining the approaches and methods to deal with contradictions among the correctly.These are important references for us to correctly understand and properly deal with contradictions among the in the new period and work hard to build the socialist harmonious society.