The purpose of this study was to investigate a specific character on products of American-cotton(Kobong) with cultivated in Sinbong-dong, Sangju City from 1997 to 2003 years. The results of this study were as follows: 1. The Kobong cotton of producted in Sangju city was superior in quality than Korean-cotton. 2. The cotton producted in 1998, 2002 and 2003 was inferior in quality than the anther producted cotton. The reasons was a heavy rain at 1998, Rusa typhoon at 2002 and Maemi typhoon at 2003 in sangju city. But Kobong-cotton was superior in quality than the Korean-cotton. Since it is so, Kobong(New improved variety of American-cotton) was superior in quality than the another kinds(Korean-cotton) from producted of cotton fibers