The present invention provides isethionic acid salt and naphthalenesulfonic acid salt of sitagliptin, and preparation methods of the same. The present invention aims to provide novel salt of sitagliptin, having excellent physicochemical stability, non-hygroscopicity and solubility, and preparation methods of the same. Novel salts of the present invention are all excellent in stability, hygroscopicity and solubility, thereby being smoothly prepared.본 발명은 시타글립틴의 이세티온산염, 나프탈렌설폰산염 및 이들의 제조방법을 제공한다. 본 발명의 새로운 염들은 안정성, 흡습성, 용해도가 모두 우수하여 제제화가 원활히 가능하다.
