In terms of network quality control of GIS UHF online monitoring devices, the consistency of network testing in each laboratory is crucial to the quality control of monitoring devices. However, due to the lack of effective laboratory testing capability comparison technology, different laboratory test results result Differently, it is difficult to guarantee the actual performance and quality of online monitoring devices installed on site. This paper uses all four typical hand holes of UHV GIS and sensors in operation as standard sensors, and compares 21 provincial companies and sensor manufacturer laboratories by measuring the average effective height. The test results are statistically analyzed using Z The comparison score evaluates the testing capabilities of each laboratory.