Aiming at the perspectives of big errors and difficult compatibility of existing automatic weather station signal simulator, this paper has analyzed the temperature measurement theory of CAWS600 and the series of ZQZ automatic weather station collectors. In this paper, the temperature channel of JJQ1 signal simulator is tested by using different types of automatic weather station collectors, and the reasons for fluctuations of test data are analyzed. Based on the temperature measurement principle of fourwire system, the high precision and extremely low temperature drift resistance, the fourwire network is constructed by signal relay, and the software compensation is adopted. It can be adapted to the temperature simulation scheme of different collectors. At last, the modified temperature channel is tested by collector and high precision multimeter. The experimental data show that the maximum error of the simulated temperature is ±0.03 ℃, the maximum error of the corresponding resistance is ±12 mΩ. It meets the industry standard QX / T 3462016 “automatic weather station signal simulator”, and provides reference for the improvement of the automatic weather station signal simulator.