Abstract: In order to perfect the policy of Gansu agricultural insurance, improve the farmers’ effective demand for agricultural insurance and then promote the sustainable development of Gansu agricultural insurance. This research analyzes the profits of the major interest subjects in agricultural insurance market by constructing the complete information static game model, which is based on the interplay among the government, insurance companies and farmers. And combined with the survey data of Gansu province, this research concludes the main factors which influence farmers to buy agricultural insurance by constructing Logistic regression analysis model. The conclusion is that in the game between insurance companies and farmers the positive response for insurance companies is not to operate agricultural insurance when farmers have insured-willingness, if the insurance companies choose to operate agricultural insurance, it will cost more(-M-P C<0), C is insurance expenses of farmers, M is farmer’s insurance claim, P is insurance company’s operational cost; farmers should be active to insure to take profits when insurance companies choose to operate agricultural insurance, farmers would definitely cost N to prevent the disaster when insurance companies choose not to operate agricultural insurance and farmers would cost more if they choose to insure agricultural insurance; in the game between the government and insurance companies, the government’s best interest is 0 and the government’s optimal strategy is not to support the insurance company to operate agricultural insurance; but insurance companies will get the best interest (-M-P C Q)(Q is government’s cost to support insurance company) only when the government support agricultural insurance, so the insurance companies will not improve the enthusiasm to operate agricultural insurance unless the government provide support. Logistic regression analysis proves that farmer’s education degree, the number of farming in a family, farmland area, agricultural income proportion and the knowledge about agricultural insurance mainly influence farmers’ behavior to purchase agricultural insurance.