Using powdered indigo and an equal amount of liquid dispersed indigo, the influencing factors during the dye reduction process, namely reduction temperature, reduction time, amount of insurance powder and caustic soda, were experimentally designed using the central synthesis experiment method. The main evaluation factors were fabric dyeing performance, friction color fastness, and fabric strength, and their respective optimal dyeing schemes were obtained. Under the optimal scheme, the Raman characteristics and COD values of the dyeing solution of the two dyes were compared. The results showed that the optimal reduction conditions for liquid dispersed indigo dyes were reduction temperature of 40 ℃, reduction time of 46 minutes, insurance powder mass concentration of 126 g/L, and caustic soda mass concentration of 98 g/L; The optimal reduction conditions for powdered indigo in commercial products are reduction temperature of 56 ℃, reduction time of 26 minutes, mass concentration of insurance powder of 165 g/L, mass concentration of caustic soda of 108 g/L. The COD value of liquid dispersed indigo dyeing solution is 2414 mg/L, and the COD value of powdered indigo dyeing solution is 2552 mg/L. The Raman spectra of the fabrics dyed with both dyes are basically the same, but the K/S value of liquid dispersed indigo is about 10% higher than that of powdered indigo