In order to improve the precise and quantitative cultivation technology of machine-transplanted rice in Panjin and investigate the optimum seeding rate for higher yield of machine-transplanted rice, Yanfeng 47 was used as material and effects of seeding rate on rice growth and development and yield were studied by plot contrast test. The results showed that due to the appropriate population growth, the maximum dry matter in full heading and maturity stage, the more effective panicles and seed setting rate and 1000 grains weight, seeding rate of B3（97.5 g/disc） got the highest yield of 10.95 t/hm², which was 3.01%, 5.80%, 8.96%, 12.77% higher than B2, B4, B1, B5, respectively.