[Objective] Precocious rape was bred and applied to avoid or reduce damages such as high temperature cooked or dry-hot wind disasters in 3 ripe stage rape producing area in Jiangxi,and ensure the high and stable yield of after-reap crop and ensure the security of grain and oil supply in China.[Method]Restorer lines and the sterile lines were bred by system breeding,and comprehensive properties and adaptability were evaluated and selected mainly through varieties comparative test and regional tests.[Result] ...