Abstract: In order to effectively evaluate the temperature field performance of brake after continuous downhill, the temperature field test system of passenger car brake based on chassis dynamometer was designed and the evaluation method was studied.Firstly, this paper analyzes the mechanism of heating up, constructs a testing system based on American NI CompactRIO platform.Brake fluid pressure sensor, brake and brake fluid temperature sensor, brake pedal angular displacement and pedal force sensor were selected according to the systematic requirements.The software of acquisition and analysis was developed based on LabVIEW.Then, test and evaluation methods were studied, and the influence of driving mode of the chassis dynamometer was considered.The temperature rising and cooling conditions were designed.The maximum temperature of the brake of vehicle, the heating rate and the cooling rate were constructed to evaluate the performance of the temperature field of brake correspondingly.The test results show that the test system can work stably and reliably, and the testing method of brake temperature field is feasible.The proposed method for testing and evaluating the temperature field of passenger car brake based on chassis dynamometer is effective and feasible.