In rotary kiln cluster moves against kiln wall. According to this feature, transient thermal conductivity of cluster and contact heat transfer coefficient of boundary between cluster and kiln wall are deduced, then heat transfer coefficient between material and covered wall is obtained. Combined with other research harvests, the heat transfer model of rotary kiln is established. The results can be shown as follows ： the temperature of material is lower when the enhancement effect towards heat transfer of rotary kiln by intermittent contact between material and kiln wall has been ignored; the higher the temperature, the greater the influence of enhancement effect on material temperature; it is beneficial to improving the quality of clinker and thermal efficiency of rotary kiln when the enhancement effect has been considered.