Abstract The heat transfer coefficient of large rotary disc dryer was calculated by using particle transfer model of moving heating-plane type．Under the assumption of total mixture of the particle bed，the heat transfer coefficient of the every segment and the whole dryer was calculated by dividing the dryer into 55 segments according to the drying process．The strength model of the major bearing parts of the rotor system was also introduced．The results conformed to the fact of the operation of the dryer．
