Using ‘Shennong 265’as material,effect of the two treatments of different sowing date and transplants density on LAI,yield and yield components was studied.The following conclusions were drawn,i.e.,delaying sowing date decreased effective tillers per 667m² and seed-setting rate obviously,and the yield was affected.Increasing transplants density increased effective tillers per 667m².With the delaying of sowing date,LAI was affected obviously.If sowing date was too late,the yield was reduced for Reproduction Stage become shorter.