[ ]:With the world"s increasing attention to environmental pollution and energy scarcity, improving the output performance of proton exchange membrane fuel cells (PEMFCs) has become one of the key directions in new energy research. Temperature is an important parameter that affects the output performance of fuel cell systems. If the battery temperature is too high, it can cause dehydration of the membrane electrode and reduce the proton conductivity of the membrane; Low battery temperature can reduce catalyst activity and affect the electrochemical reaction of the fuel cell stack. This experiment analyzed and studied the temperature variation of anode closed air cooled fuel cells with load current. The experimental results show that regardless of whether the load current increases or decreases, the rate of change and temperature uniformity of the fuel cell stack temperature are related to the step size of the load current change. At the same time, the speed of the fan and the water content inside the fuel cell stack also affect the temperature distribution of the fuel cell stack.