Disclosed is a hydrochloride crystalline salt form of (5S,8S)-8-[{(1R)-1-(3,5-Bis-(trifluoromethyl)phenyl)-ethoxy}-methyl]-8-phenyl-1,7-diazaspiro[4.5]decan-2-one , represented by Formula I and methods of preparing the same.本發明揭示由式I表示之(5S,8S)-8-[{(1R)-1-(3,5-雙-(三氟甲基)苯基)-乙氧基}-甲基]-8-苯基-1,7-二氮雜螺[4.5]癸-2-酮之氫氯酸鹽及甲苯磺酸鹽結晶鹽形式及其製備方法。