In order to scientifically analyze the quality of operation data of the direct current wind tunnel,taking the WZ860070-E type direct current wind tunnel as the research object,the test experiments on the flow field uniformity and stability of the wind tunnel were carried out with reference to QX/T84-2007"Performance Test Specifications for Meteorological Low-Speed Wind Tunnels".The measurement result uncertainty evaluation was carried out for the test results of flow velocity uniformity and stability at the test points of 2,40,and 60 m/s through the GUM method.The experiment shows that the component introduced by measurement repeatability is the main influencing quantity,the evaluation result of expanded uncertainty basically meets the qualified criterion of JF 1094-2002"Evaluation of Measuring Instrument Characteristics",and the credibility is relatively high,affected by the performance of the test equipment and external factors,the expanded uncertainty results of the measurement results of the uniformity and stability of the 2m/s wind speed flow field are larger compared with those of the high wind speed.