Due to the existence of internal resistance and polarization, there will be a large voltage drop at the discharging moment of the lithium battery, especially the high-rate pulse-discharged lithium battery. The power characteristics of high-rate pulse-discharged lithium battery were studied, as well as the influence rules of temperature, state of charge and aging on battery power performance. The power characteristic curve of lithium battery was defined, a high-rate battery test plat-form was built, and experimental research was carried out from three impedance sensitive factors: temperature, state of charge and aging. The research methods and conclusions are of certain significance for the peak power evaluation and power curve prediction of lithium battery system.