Abstract:Under the background of strictly controlling the total amount of construction land and decreasing newly increased construction land, revitalizing the stock of land for construction is to ease the contradiction between supply and demand of land in Shandong province, and to gurantee sustainable economic and social development. But the causes of idle and inefficient land use are complex. It is not only the result of the combined effects of the government, enterprises and market, but also the product of historical development. On the basis of deep research, the causes of inefficient and idle land use have been analyzed systematically, challenges and difficulties faced in liquidizing idle and inefficient disposal land have been interpreted, guiding principle of liquidize stock land has been put forward, and institutional mechanism for preventing inefficient idle land has been built.