Abstract: It is found that the expressions MR=(M-M_e)/(M₀-M_e)=exp(-kt^N) can predict the change of moisture content exactly in pulsed fluidized bed. The coefficients(k and N) are mainly affected by the temperature of air, the velocity of air, the frequency of pulsed air and the thickness of the materials. That is, there are many factors in this model, so the quadratic recursive orthogonal knockdown design was used to establish the connection between the coefficients and four factors. The mathematical model of pulsed fluidized bed drying has been established in the paper. It is proved that the change of moisture content of the corn can be predicted exactly by the mathematical model in the drying process according to the experimental results.