Abstract: To provide a new approach of research into the cooperation relationship,a quantitative method of calculating enterprise cooperation motivation was put forward based on the balance theory and the expectancy theory.By analyzing the structure of the enterprise cooperation motivation,its calculation procedure was brought out.With the expectancy theory,a model for expectancy motivation was given.Based on the balance theory,methods of calculating balance coefficient,buffer value and amended balance coefficient were given,and a lag model for calculating the amended balance coefficient was built.Three necessary conditions for enterprises taking actions were analyzed,i.e.,the actual balance coefficient,the total buffer value and the amended balance coefficient should be controlled in a certain range.In addition,a calculation model for unbalanced enterprise cooperation motivation was established.On the basis of the above,a method to calculate general enterprise cooperation motivation was given by calculating enterprise external resistance.