The design and performance of two-channel constant temperature wind tunnel detection system is introduced. The tunnel system can make temperature and wind speed stable, and the differential temperature can be adjusted. The performance of the system is tested through experiments. The standard deviation of air temperature fluctuation of the fixed points in wind tunnel (0.025℃-the maximum) is smaller than which (0.059℃)in room. The transverse field of temperature in wind tunnel is not homogeneous, which in cold and heating tunnel the standard deviations are 0.044℃ and 0.059℃. The system is used as a platform mainly for testing HTP-2 micro-thermal meter. It is proved that heat radiation has bad influence on measurement of micro-thermal meter by the system, and the radiative heating of the wire filament of micro-thermal meter is 0.365℃.