This work has been conducted to study the quality properties of different quality levels within each cotton category and to find the stan‌dard limits for this quality levels. Quality properties of commercial cot‌ton varieties grown through thirteen years (1982-1994) were studied. The essential findings of this study could be summarized as follows :- 1. Commercial cotton varieties of each cotton category differ signifi‌cantly in most quality properties. 2-Commercial cotton varieties of each cotton category was divided sig‌nificantly into two separate quality levels. 3-Confidence limits at 1% level of significance were made for the quali‌ty levels of each cotton category.