The analysis of the working principle and links of the test equipment for vehicle RF conducted emission on AC power lines is helpful to improve the accuracy of test results and troubleshooting efficiency.This paper systematically introduces the complete process of troubleshooting,system principle analysis and bench validation for vehicle RF conducted emission test on AC power lines,and gives the basic ideas and disposal methods for the analysis of vehicle RF conduction emission test problems on AC power lines by analyzing the two typical cases of large deviations in results of vehicle RF conducted emission test according to GB/T 40428-2021"Requirements and Test Methods for Electromagnetic Compatibility of Conductive Charging of Electric Vehicles".