This paper analyzes and designs a set of high-precision missile-borne pressure for complex environment temperature in response to the problem that the sensor is susceptible to the complex and changing test environment during the missile-borne pressure test process, resulting in a large deviation between the test results and the actual value. The test system was tested and tested. The test results were compared with the output of the conventional pressure test system. The results showed that the maximum relative error of the full-scale range of the missile-borne pressure test system was 0. 025 6, which was the largest for the conventional pressure test. 1 / 4 of the error. In order to meet the higher accuracy test requirements, the improvement of the original test system was completed by means of secondary compensation, and analyzed the system test results before and after the improvement. The results showed that the maximum relative error of the full-scale of the improved test system is reduced to 0. 004 8, and the test accuracy is improved by an order of magnitude compared with before the improvement.