Based on a theoretical discussion of influence of urbanization on agricultural supply-side structure change and supported by the Distributed Lag Model,this article reveals that the influencing factors of agricultural supply-side structure change are the basis of agricultural supplyside reform policies.The result shows that urbanization will affect agricultural supply-side structure through consumption and demand structure of agricultural products and the scarcity of agricultural production factors,which presents an obvious lag effect.If the lag effect lasts too long,it will lead to structural problems in agricultural supply-side.Therefore,in the process of impelling the structural reform of agricultural supply-side,we should create a good environment for agricultural production and management to adjust the lag effect of agricultural supply-side structure,promote the mutual coordination between supply and demand,and strengthen the division of labor among agricultural producers.