Taking Yanfeng 47 as the material, the effects of reducing nitrogen and increasing silicon and transplanting density on rice growth and yield were studied by plot comparison method. The results showed that increasing transplanting density by appropriately reducing nitrogen and increasing silicon could effectively improve the number of harvested panicles per unit area, the rate of panicle, 1 000 grain weight and seed setting rate, promote the increase of dry matter accumulation after full panicle, enhance plant disease resistance and reduce the risk of lodging at later stage of rice. The results showed that the yield of N2-18 was 11.74 t/ha, which was higher than that of N1-18, N1-21, N2-16, N3-16 and N3-18 by 2.18%, 1.47%, 6.24%, 8.20% and 9.01%, respectively. If the amount of nitrogen fertilizer is reduced, the yield will decrease.