Air handling unit temperature control system is composed of a proportional integral TC-1 temperature controller,wind pipe temperature sensor TE-1, the electric control valve TV-1 and the integrated control box of WSK 02.TC-1 controller is the function of the sensor TE-1 detection temperature and set temperature controller iscompared, and according to the result of the comparison, the proportion, integral calculation, to control TV-1 electric valve, so that the air temperature in the temperature range required. With the fan start and stop function, when the fan is started, the electric air valve is opened, when the fan is stopped, the electric air valve,electric water valve with closed. When the filter is blocked, the pressure switch is switched to DPS-1 signal alarm device.