Abstract: The grey related theory was applied to the analysis and research of main influence factors of grain production in Liaoning province. The quantitative results objectively revealed the relations between the grain production and influence factors and showed that the degree of grey incidence of main influence factors in sequence was: grain unit production, seeding area, quantity of pure fertilizer, valid irrigated area, total power of agricultural machine, quantity of rural utilized electricity and disaster area. Based on the results, the sustainable development strategy and suggestions of improving grain production were illuminated.