Abstract: In order to study the relationship between yield、maize ear treats and organ matter、N－OH、available P and K, we selected field block with different soil nutrition in Mei county, Shaanxi province. The result showed that under the level of N-OH、available P and K in the soil, the ear length、seed length、kernel per row、kernel per ear、1000-kernel weight and yield increased with increasing the available N、P and K. To improve organ matter、available P and K would increase yield for there are defiance organ matter、available P and K in the soil.