Abstract:The high-yield ratoon rice system under simplified cultivation (direct-seeding and seedling-throwing) was studied by the experiment of different planting patterns and seeding stage in 2009 and 2010 at Yujiang country, Jiangxi Province, and the source-sink characteristics, biomass, nitrogen accumulation and yield of ratoon rice were also analyzed. The results showed that leaf area index of direct-seeding and seedling-throwing in main ratoon rice were lower than transporting by 5.1% - 57.8%. In main rice, grain numbers were decreased than transplanting by 25.3% - 41.2% in direct-seeding and seedling-throwing, and reduced by 9.9% - 46.5% in ratoon rice. Biomass of direct-seeding and seedling-throwing were decreased by 23.7% - 53.2% in ratoon rice, and nitrogen accumulation were reduced by 20.0% - 54.4%. This indicted that grain yield of direct-seeding and seedling-throwing were lower than transporting by 30.1% - 35.1%. However, temperature and solar of different seeding stages were different in main and ratoon rice, and seeding earlier could attain more temperature and solar in ratoon rice. Source-sink relations, biomass and nitrogen accumulation and yield were significantly higher than others when main rice was seeded in late March and early April. So, source-sink relations of direct-seeding and seedling-throwing could be improved and ratoon rice yield could be increased through adjusting seeding stage.