Abstract: By using a small ventilated chamber, a new method was presented to measure the parameters of VOCs emission from the particle board (the average initial concentration and the partition coefficient) and the convective mass transfer coefficient. The emission parameters of particle board P1 to P4 from northeastern China were estimated, and the relationships between VOCs emission characteristics of particle board and relative humidity were discussed. It is concluded that there are significant influences on average initial concentration of particle board and partial influences on the convective mass transfer coefficient, whereas there are different influences on the partition coefficient about different relative humidity. The results are useful for evaluating the indoor air quality under different environmental conditions and controlling the indoor concentration of VOCs.