In this study, the life cycle analysis (LCA) of finished fabrics produced as denim and sportswear products of soy protein fiber, an innovative natural fiber, was examined. In the study, 8 different blends consisting of cotton, soybean fiber and cotton/soybean blend yarns were used to be used in the weft of woven fabrics selected from the denim and sportswear product group. The ratio of soybean fiber is selected as 10%, 30% and 50% in the blend, and the other blending material is cotton. Weft yarns are produced in two different yarn counts, Ne10 and Ne16. The warp thread is the same in all fabrics and is 100% cotton material. Fabrics produced using these yarns; It is woven as 8 different fabrics, four of which are denim and four are sportswear. Finished fabrics were obtained in the denim and sportswear production line, under operating conditions. Anti-bacterial activity, color fastness and some fabric performance tests were applied to the sample fabrics. It has been observed that soy fiber content does not adversely affect the fastness and performance of woven fabrics. All fabric samples in the study were analyzed by Life Cycle Analysis (LCA) study, separately for denim and sportswear lines. The best result in the life cycle analysis study of soybean fiber; It was obtained in fabrics using 90% cotton-10% soy fiber in weft for denim fabric and 50% cotton-50% soy fiber yarn in sportswear fabric production.