Abstract: In the study,a two-dimensional,non-isothermal,two-phase flow steady-state model of proton exchange membrane（PEM）electrolyzer cell is established to study the distribution of temperature,liquid water saturation and membrane water content at different voltages in the membrane electrode assembly of electrolyzer cell. Besides,the effects of temperature,liquid water saturation and membrane thickness on the performance of electrolyzer cell are investigated. The reliability of the model is validated by experimental results. The results show that although the contact resistance is neglected and the membrane wettability is good,the percentage of the ohmic loss can still reach up to 34.7% at high voltage（2 V）. As the cell voltage increases,the dominant factor of the overpotential changes from activation loss to ohmic loss,and the loss of mass transfer accounts for a minor proportion of the total overpotential. When the voltage is lower,the membrane water content is the main factor affecting the PEM conductivity,and when voltage is greater,the temperature becomes the main factor to determine the PEM conductivity. The performance of the PEM electrolyzer cells can be effectively improved by increasing the temperature and the liquid water saturation,or decreasing the membrane thickness.