The farmland reform,which is the evolution from the agricultural cooperative system to the household contract responsibility system,and then to allowing transforming farmland use right within limits,is actually a process in which the fully communal farmland has gradually become the private property of farmers.Through a dynamic game model,under the circumstances of using the traditional agricultural techniques,we believe that the agricultural coproduction system will lead to a collective loss of faith in the farmers and the prevalence of lazy behavior.The implementation of the household contract responsibility system makes the incentive system question in the production of agricultural cooperation no longer a problem.However,as modern agricultural production technology increases agricultural output,and the economic development increased the opportunity cost of farmers engaged in smallscale household contract responsibility system,there is a strong economic incentive for massproduction of agriculture,which inevitably requires the right to use farmland can be freely traded within limits.