Abstract: This article approaches the influencing factors of Yunnan grains production with quantitative analysis, classifies the factors influencing Yunnan grains production to two kinds of factors, indirect factor anddirect factor, according to the influencing stratum. The direct factor is analyzed by Factor Analysis Approach，the indirect factor is analyzed by Method ofGrey Relational Analysis. With the knowledge of the importance of different factors, this article offers theory and data base for the government to achieve a stable future grains production with suitable method and means.