Soaping agent for polyester-cotton blend in the one-bath process SW-TC(AX-R601) is used for cotton-polyester blended fabric, after dyeing polyester, it does not need to be restored and washed directly to dye cotton, using SW-TC to clean after dyed cotton, it can efficiently remove some unbound disperse dyes and reactive dyes adhering to polyester and cotton fibers, improving production efficiency and shortening the process flow.