Sufficient and stable supply of grain is the core of grain security. Since proposed, the industrial cluster theory has been gradually applied to the agricultural field. Since the reform and opening up, China's grain productivity has been substantially increased, but domestic grain supply is still inadequate. Although the agriculture in the optimized development area of our country is relatively developed at present, the grain production in the moderate development area and the protection development area are not optimistic. The major international grain export countries have formed the development model of grain industry cluster such as specialization and regionalization of grain production. China can draw lessons from their experience in many aspects, like providing advanced agricultural education, science and technology, and strong government security policy. Therefore, China should adjust the distribution of grain industry reasonably, actively guide the development of leading enterprises of grain industry, establish and improve the supporting policy of grain industry, and promote the development of grain industry cluster of our country across the board. All these will help lay a solid foundation for China's food security. To the Country people is all-important, to the people foodstuff is all-important. Sufficient and stable supply of grain is the core of grain security. Nowadays, the constraints of domestic resources and environmental elements have been increasingly obvious and the productivity of agricultural technology have met with growth slowdown, leading to the cost increase of the domestic grain production and the labor. Grain import usually makes the grain price decrease, and the increased planting cost and decreased grain price are bound to substantively weaken the market competitiveness of the Chinese grain industry. As a result, China can’t realize adequate grain supply, which thus causes the of grain security. Therefore, the urgent tasks are to pay attention to the food security of our country, to improve the comparative advantage of our grain industry, and to enhance the competitiveness of the Chinese grain industry in the international market. Not only can the industrial cluster gain the benefits of scale economy and reduce the cost, it can also utilize the resources and exchange information and experience more efficiently, and then improve the competitive advantage of industries. In short, as a new way of organization, the industrial cluster can enhance the comparative advantage of the original industries and even create a new comparative advantage.