The paper creates the state model of the contract based on the model of GHM in theory of property. By analyzing the model,this study elaborates two key issues .The first key issue is to identify risk factors and divide responsibility .The second issue is to identify critical control point of contracts state compensation .This paper identified twenty—two risk factors that could change the state of contract, and found critical control point of contracts state compensation in both cases. This conclusion provides theoretic support for guarding against dispute in the future.