Solution Cathode Glow Discharge-Atomic Emission Spectrometry (SCGD-AES) is a novel rapid, high efficient and real-time online element analysis method, which can be applied to metal elements detection in water. In order to achieve accurate and stable measurement of Mn elements in water, solution cathode glow discharge-atomic emission spectrometry coupled with portable spectrographs (Maya 2000 Pro) were used for the detection of manganese elements in aqueous solution in this paper, and three portable spectrographs with different entrance slit and resolution were employed for the determination. The influence of the entrance slit and resolution of the spectrograph on the spectral detection were studied experimentally, the results showed that the intensity of spectral lines increased when the entrance slit increased. The higher the resolution of the spectrograph was, the higher the ratio of spectral intensity to background intensity was was also concluded. The effects of solution flow rate and discharge current on the emission spectrum of manganese were investigated, and a higher signal background ratio was obtained at a flow rate of 186 mL·min-1 and a current of 65 mA. The spectral detection stability of manganese under optimized experimental conditions with flow rate at 186 mL·min-1 and discharge current at 65 mA was tested, and the relative standard deviations (RSDs) of the three portable spectrographs for measuring the spectral intensity of Mnin a continuous period of time were 059%, 061%, 080% respectively, showing that the stability of detection is good. The analytical performance parameters of manganese were also discussed, and the limit of detection were 428, 651, 338 μg·L-1, respectively. The manganeseelement in the calibration substance was quantitatively analyzed, andthe error range was 002%~208%, the precision ranged from 063%~154% and the recovery rate of samples was 97%~99%, which indicates that the method has high accuracy and stability. The results show that the solution cathode glow discharge-atomic emission spectrometry coupled with portable spectrographis a useful technique for accurately detecting trace manganese elements in aqueous solution.