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Analysis, evaluation, and comparison are conducted on the test results from five metrological laboratories over Northwest China to find problems and summarize experiences timely, so to improve the laboratory’s test/calibration capability and quality management level. Comparative experiments are conducted on the pressure, temperature, humidity, and wind speed samples from the five metrological laboratories, respectively, and a statistical analysis is carried out by means of the 〖WTBX〗E〖WTBZ〗n (normalized deviation) method. The comparison results of temperature, humidity, and air pressure from metrological laboratories over Northwest China are very satisfactory, and that of wind speed is satisfactory. The comparison test data is objective, realistic and credible. The experiment is a comprehensive evaluation of test/calibration capability of metrological laboratories, can reflect the technical level of the test/calibration personnel and the current situation of meteorological metrological standard equipment objectively.