Abstract: In this paper, the change relationship between planting density and yield component factors was defined basically by researching the differences of the yield structure of the different corn planting density, and with the increase of planting density, the variation of yield component factors contributed to the maize yield was also cleared. The results show that panicle number is the main factor which affecting the yield and has the maximum contribution to the yield under the certain density. The grain number and 100 grains weight are the main factors which affecting the yield and have the maximum contribution to the yield within the suitable planting density.

Key words: corn, planting density, yield component factor