In the industrial and agricultural production, the main role of the device is the dryer generates heat to coal, fly ash, chicken and some substance material drying. So we use the rotary dryer is dried, the most important is the need to solve the thermal problem. Then you know rotary dryer equipment work thermally how handle it? (1) Environmental objects with the convective heat transfer fluid temperature between the two affect each other. So when we discuss body temperature, surface flow will normally be fixed, as the temperature field problem solving boundary conditions, the simplified thermal convection dryer problem; temperature field (2) the physical properties inside the object usually associated with thermal properties of objects related to thermal properties of an object varies with the temperature. So when we study the dryer will function through a known object thermal properties and temperature to determine the temperature field inside the object, determined dryer working time; temperature field (3) Time of objects in rotation Different stages have different characteristics dryer running. Its roughly divided into: the initial stage, the entire temperature field greatly affected by the initial conditions, the impact of environmental conditions in the vicinity of the object boundary only performance; quasi-steady-state phase, the internal body temperature of each point with different environmental conditions showed some regularity; steady-state stage, the temperature at various points inside the object is no longer significant changes over time. With the extension of the drying time, the moisture content of the material is also changing; geometry (4) shape of an object affect its internal temperature distribution. Therefore, we must consider the impact of the geometry of the object in the selection of the temperature distribution dryer Shihai, and its abstraction.