Used the directed acyclic graph(DAG) with the impulse response and forecast variance approach of structure VAR model,this paper analyzed the transmission channel and the effects of international food prices fluctuation on China's economy.The results show that the impact pathway of international food price fluctuation on domestic CPI and industrial output is not obvious,and the only fluctuation is the buying price of domestic agricultural products,which provides direct or indirect transmitting to domestic consumer price level through the impact of the factory-gate prices....