In order to test whether “large country effect” exists in China’s barley import or not ,this paper analyzes the market power of barley of Australia,Canada and France in China’s barley import market by using Residual Demand Elasticity Model.The result shows that Australia’s barley and France’s barley have relatively weak seller market power in China’s barley import market,while Canada has no seller market power.China’s barley demand has significant influence on barley’s imported price from each exporter,and “large country effect” exists in China’s barley import.Canada’s barley and France’s barley can be mutually substituted to some extent in China’s barley import market.The adjustment of barley trade policy in China has different influence on the imported price of different exporters.Therefore,this paper suggests that in order to improve buyer market power of barley import,tracking researches on domestic and international barley market situation should be enhanced,regulation policy system of barley trade should be built and improved and source market structure of barley import should be optimized.