【Objective】This project aims to definitude the production changes of historical cotton cultivars in Xinjiang,in the hope of providing a theoretical basis for the cotton breeding. 【Method】16 historic cotton cultivars were selected in Souther Xinjiang as materials since the 1950 s,and the evolution of their yield traits was studied.【Result】With era change,bolls per plant first decreased slightly and then increased,boll weight first increased and the reduced,lint showed an increasing trend,and lint yield and s...