In order to research the effect of planting density on rice,take Dexiang 4103 as test material,controlled different planting density on rice in middle fertifity paddy field of Rongxian county was tested.The results showed that the yield of planting density at 180-225 thousand hills/hm2 reached the highest yield in test,yielded over 9.0t/hm2,the production and application of stimulation effect is extremely significantly.