A total of 40 conventional varieties from upland cotton were employed to investigate the content of seed oil.Apparetly difference was found in the 40 different varieties.The average content of cottonseed oil was 31.03 %, the cottonseed oil contents varied widely from 27.77 % ~40.36 %, the variety with the highest oil content was CCRI 16,the lowest was Yumian 11.The fiber quality analysis of these 40 species showed that the best-quality fiber was Chuanjian 1, the worst was Jinmian11.The correlation analysis between cottonseed oil content and...