The present invention relates a pharmaceutically acceptable salt of renal outer medullary potassium channel inhibitor. In particular, the present invention relates a pharmaceutically acceptable salt of renal outer medullary potassium channel inhibitor, particularly the L-tartrate and its type I crystal and type II crystal thereof. The pharmaceutically acceptable salt of ROMK inhibitor, particularly L-tartrate improves bioavailability and stability.本發明涉及一種腎外髓質分泌鉀通道抑制劑的可藥用鹽。具體而言,本發明涉及一種腎外髓質分泌鉀通道抑制劑的可藥用鹽,特别是其L-酒石酸鹽及其I型結晶和II型結晶。所述ROMK抑制劑的可藥用鹽,特别是L-酒石酸鹽提高了生物利用度和穩定性。