In this study，a liquid cathode glow discharge-atomic emission spectrometry（LCGD-AES）was developed for the simultaneous determination of K，Ca，Na and Mg in salt mine of Geermu，in which needle like Pt was served as anode and overflowing electrolyte from a quartz capillary acted as the liquid cathode.The effects of discharge voltage，solution flow rate，supporting electrolyte，solution pH and interfering matrix components on the emission intensity were investigated in detail.The results were compared with those by ion chromatography（IC）.The optimum conditions were as follows:discharge voltage:650 V，flow rate:3 mL·min-1 and supporting electrolyte:pH 1.0 HNO3.The detection limits（LODs）for K，Ca，Na and Mg were 0.100 0，0.048 0，0.002 4 and 0.003 9 mg·L-1，respectively.The relative standard deviations（RSDs）were 0.57%，1.8%，0.94% and 1.8%，respectively.The results obtained by LCGD-AES were consistent with those by IC，and the recoveries for the analytes were in the range of 95.4%-108%.