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 m/s, 40 m/s, 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 JJF 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.