Abstract: By statistical analysis of the 30 years rainfall of Luoyang,Henan Province,the different patterns of annual precipation were stimulated and the water proof sheld was used to study the effects of different compositions of N,P and water on the yield of winter wheat.The result of experiment showed that,under the condition of sufficient soil water (20%) before sowing supplied,the yield of winter wheat are significantly affected by N,and are less affected by P and water;the effect ability of interaction between two elements on yield of winter wheat are N and waterN and PP and water;No metter what level the P and water,the effect low of N on the yield of winter wheat was similar,and no matter what level the N and water,the yield of winter wheat is the highest at the reasonable of P (225kg/hm2).