With the bouncing back of economy in our country,the investment in real estates tends to be overheated.This paper firstly introduces the basic situation of investment in real estates in our country,then summarizes the reasons for economical fluidity surplus in our country,and then defines "fluidity surplus".Based on these this paper carries out a theoretical and empirical study on the relationship between real estates investment and fluidity surplus.The results support the theoretical analysis,indicating that fluidity surplus is one of t...