In this paper, PES fiber was dyed in carrier dyeing process with Foron dyestuffs. The dyeing performance was evaluated by K/S value and colorfastness. The results showed that Dilatin POE can improve the dyeability of PES fiber consumedly, but the strength of the yarn decreased with the adding of the carrier. Dyeing at 90 ℃ for 45 minutes with 0.8 g/L carrier Dilatin POE has good dyeing effect on PES fiber and the breaking strength of the yarn decreasing about 10%. After dyeing,the colorfastness to washing and rubbing were good.