With the increasing prosperity of financial development,this paper uses the data of Shanxi and Beijing 1999-2015 to analyze the informal finance in Shanxi Proxince.Using Granger causality test to test the relationship between the informal finance and economic growth in Shanxi Proxince.The results show that:the informal financial development of Shanxi province is not the cause of economic growth.At the same time,the economic growth is the cuase of the informal financial development.