Temperature in core of mat(TCM) is always influenced by atmospheric temperature when particleboard production building has neither heating system nor heat-retaining measure. When atmospheric temperature is 38℃ TCM may be 40℃ and lower than 8℃ if atmospheric temperature is-7℃. Hot press time must be longer than the normal one if TCM is lower than 15℃, what is more, blow may occur at any moment. On the contrary, relative high TCM, for example, 25℃ is good for shortening press circle. To ensure that partieleboard production has high efficiency, TCM must be controlled. For this purpose heating the air that flows into mat forming machine is remarkable effective and economical. It is also feasible in technology.