To measure and assess the energy efficiency level of charging stake, this paper has designed an energy efficiency measurement scheme for electric car DC charging pile. This scheme can measure the power loss of each part during charging and the result can trace to the source by choosing appropriate measuring points and energy meters combining economy and veracity factors. Based on this scheme, make simulation for charging pile module and test actual DC charging pile to get the waveform and electric data. Calculate the energy loss of charging pile according to the data. Contrast the theoretical loss analysis with simulation and actual measuring results to research and examine the accuracy of energy efficiency measurement scheme and provide the basis for energy conservation of electric vehicle charge.