This paper investigates the relationships between China's corn price and international crude oil price using time series technical methods, we find that, (1) There are mutual Granger Causalities between China's corn price and international crude oil price; (2) China corn price can be positively influenced by last period's corn price and international crude oil price, but the international crude oil price is only effected by its last period price;(3) A unit shock (innovation) in international crude oil prices will give an inverse "U" shape effect on China corn;(4) Before 2009, China's corn price and international crude oil price are not cointegration, but after that, China's corn price have a salient cointegration relationships with international crude oil price; (4) We predict that China corn price will slightly decrease, and international crude oil price will increase mildly in the future. Policies to evade international crude oil shock on China's corn price are proposed.