The drying process of a multilayer belt dryer was modeled and simulated considering both the heat and mass transfer by C language. The data of the moisture content and temperature distributions in material bed and the air humidity and temperature profiles in air channel above material bed were obtained from the results of the simulation. The drying experiment data of garlic slices in an industrial scale dryer was obtained to verify the validation of the model. Then, based on the drying kinetic data obtained from the further simulations, the proper parameters of dryer structure and operating conditions were discussed, including belt length, number of belt layer, height of air channel, belt flip time, thickness of material bed and air velocity.