| As one of the biggest commodity grain bases in China, northeast China plays an important role in national grain security. The paper discussed the trend of structure changes of grain production between 1978 and 2002 based on grain yields and planting areas. Aggregated comparative advantage of corn, soybean, rice and wheat were analyzed applying Revealed Comparative Advantage Index. The grain yield kept increasing as a whole but fluctuated frequently. Trend of specialization and regionalization was obviously with the grain production converging to predominant areas, and the production pattern of corn, soybean and rice as priority was set up. The Aggregated Comparative Advantage of corn and soybean was stronger than that of rice and wheat, but there was some advantage of quality and efficiency for the latter. Countermeasures of structure adjustment of grain production were put forward so as to optimize agricultural structure and grain production distribution in northeast China. |