Abstract: Out the use of.311-A saturated Design,which is the establishment of a Irrigation Quota, nitrogen and phosphate fertilizer production of oats on the mathematical model, and crude ash,crude protein,total-N,total-P,total-K,plant leaf area and yield in the mature of Oat were determined,research on N ,P and water production coupled with the effects of mature plants and coarse ash,crude protein,total-N,total-P,total-K,plant leaf area and the correlation between production. The results showed that： its relevance for the order： plant leaf area〉total K〉total N〉total P〉coarse ash〉crude protein, plant leaf area and yield were significantly related.Through the study of N,P,water production plant, can be drawn that： N： 200kg/hm^2, P：102kg/ bin^2, water800mm proportion of the conditions to achieve maximum production.