Edoxaban toluene sulfonate (EDXB) enantiomers and epimers can affect the quality of API and related preparationsThe preparation and liquid phase separation control of EDXB isomers can effectively control the content of isomeric impurities in EDXB drugs and improve the quality of drugs.The synthetic process of EDXB isomeric impurities was studied with 3-cyclohexene-1-carboxylic acid and phenylethylamine as starting materials.The isomeric impurities and EDXB drugs were separated and purity confirmed by high performance liquid chromatog.Structures of the three isomeric impurities were characterized by NMR.In this paper, high-purity EDXB enantiomers (1R, 2S, 4R), EDXB epimers (1R, 2R, 4S) and EDXB epimers (1s, 2S, 4R) were prepared, which could solve the current market shortage of EDXB isomers.