Abstract: To investigate whether the ground environmental simulation test of de-mission receivers can fully and effectively verify the in-orbit working environment, channel AGC was selected as the adequacy verification parameter of environmental simulation tests by taking advantage of the sensitivity to noise of the high-sensitivity receiver. According to the ground test data of multiple de-mission receivers in environmental tests, the consistency of AGC parameters of multiple batches' receivers is analyzed. It is concluded that the channel parameter differences of de-mission receivers are very small. On this basis, by comparing the in-orbit AGC data with the ground environmental test of multiple high-sensitivity receivers, the range of AGC numerical differences caused by environmental differences was defined, which could provide reference for the ground environmental test and in-orbit flight of subsequent products. Based on the analysis on the reduced channel bottom noise of multiple receivers during in-orbit flight, it is concluded that the ground simulated electromagnetic environment is worse than that in space.