The result indicated that the cultivation experiment of different seed quantity and seedling age on CHAOCHAN 2 could clearly increase the quality of seedling with 100g seed quantity per square metre and 40～45d seedling age,and not only the root system of rice shoot developed flourish,having two tiller,the 100-seedling dry weight reached 7.7grams,the numbers of vascular bundle reached 14,but also the panicles per square metre,the spikelets per panicle,the weight of total spikelets per pland and yield became better.The cultivation ex-periment of different seedling number per hill indicated that the method of Single Seedling Transplant could clearly increase the days of effective tillering,tillering ability and percentage of earbaring tiller,the spikelets per tiller,setting percentage and 1000-grain weight.At the same time,this method improved the rate of spikelets to leaf per hill,productive leaf area,higher effective leaf area,and the productive ability of later population photosynthesis,gaining the high yield,and the yield reached 11788.5kg /hm²,increasing yield per mu more than 23% than poly-seedling transplant.