In this paper in the natural disasters such as earthquakes and shelter space range sensor volume restricted and parameters on the surrounding environment perception problem, a gas sensor for a three-dimensional micro assembly tester, combining with the design of GPSO - BP algorithm, the tester can realize real time under high temperature and high humidity environment to the concentration of toxic gases and pressure of multi-parameter measurement, And the temperature and humidity compensation, with high performance, miniaturization, high accuracy characteristics. The test results show that in the humidity of 80%RH, temperature of 50℃ environment measurement of different gases, after the temperature and humidity compensation, the accuracy of the tester is improved to at least 2.2% above, strong stability, for earthquake and other harsh environment of environmental parameters perception is of great significance.