As important factors influencing the physical and mechanical properties of waste paper/wood composites, hot pressing temperature and time are the principal parameters of hot press process. To attain better hot pressing process conditions, waste paper/wood composites were produced with poplar shaving as raw material, waste paper as supplement, and isocyanate modified urea formaldehyde as adhesive resin. The effects of hot pressing temperature and time on the physical and mechanical properties of waste paper/wood composites were tested. The results showed that as hot pressing time increased, the physical and mechanical properties of waste paper/wood composites improved. In the range of 140~170 ℃, increasing hot pressing temperature helped enhance the physical and mechanical properties of waste paper/wood composites. The appropriate hot pressing process condition for the waste paper/wood composite was 30 s per mm board thickness and 170 ℃ hot pressing temperature.