County Economy is the important part of the economic development of our country.It plays important roles of the macro base，reform exploration，comprehensive experiment and economy support，and has important senses to prosper the economic development，maintain social stability，realize the goal of building a well off society in an all round way and build a socialist modernization with Chinese characteristics.This paper makes the review of the development of county economy of Shandong during reform and opening.By the analysis of the development course，experience and achievement of the development of county economy of Shandong during reform and opening，it will have an important helpful improvement to the development of county economy of Shandong in future.