Abstract: In China, the concern over food has been given first priority. The concept of food has been narrowed to something equivalent to grain or foodstuff due to the traditional idea that "food was the heavenly principle to people". The ideas of "foodstuff would be shared by human beings and livestock" and "foodstuff-pig agriculture" caused a big dilemma to the stratagem of safegarding China's food security. The concept of Food Equivalent Unit is introduced and the midium and long term goals in development of Chinese food system based on the 2 +5 model was proposed. The model would be not only able to yield enough grain production for people to consume but also able to produce the amount of fodder twice over the grain. Advantages of the agro-rassland system should be fully taken in order to develop the produtive potentials of the Farmland Equivalent Unit in China thereby to solve the problems of Chinese food security fundamentally.

Key words: Ammonium , food security , ood, agro-grassland system, Food Equivalent Unit, Farmland Equivalent Unit, food security ood, agro-grassland system, Food Equivalent Unit, Farmland Equivalent Unit