Aiming at the disadvantages that the product has the abnormal smell and qualified products can only be get after the secondary purification with lower productivity (around 90%). In the current synthesis process, allyl isoamyl xanthate ester by using synthetic additives NF-1, the abnormal smell in allyl isoamyl xanthate ester products and tail water has removed successfully, the purity of allyl isoamyl xanthate ester(semi-finished products) can reach more than 90% without secondary purification, the yield of the product has improved to 95%, and the synthesis process has been simplified. The beneficiation reagent results show that the improved pharmaceutical products beneficiation indexes are excellent.