Virtual water is a new way to solve the problems of water resources scarcity and food security. The paper selected nine counties in Heilongjiang Province in recent years where the yields of rice, corn and soybean is top as the study area, and calculated the unit value of primary products of virtual water content of three kinds of grain crops from 2010 to 2014.The results show that the virtual water content of soybean is the highest, followed by rice, maize.The value of virtual water content of soybean is about 3 to 4 times of rice and Maize.Heilongjiang province is one of China's important base of commodity grain production.The output of commodity grain leads to large output of virtual water.Therefore,it is necessary to improve the use efficiency of water resources in the field of agriculture.