China has realized food security at the national level, but there are still some areas and populations vulnerable to food insecurity due to disparities between urban and rural areas, and among regions. The concept of food security in this paper covers grains, and also foods rarely covered in a general research on food security in China. It reviews and evaluates the food security status in poverty counties between 2002 and 2007 from perspectives of food availability, access, consumption and nutrition, utilization and vulnerability to food insecurity. With Cluster Analysis, it indicates that the 271 poor counties in 9 provinces are confronted with serious food insecurity problems. Farmer's income, education, family scale, work type, land area and nationality are the main factors influence food consumption of the rural poor.