Temperature control is divided into two parts, one is the temperature upheaval problem of preliminary dry in the driving and belt dry rooms. If the temperature rises too fast, it can damage equipments; Another is the requirement of constancy of temperature of preliminary dry and belt dry rooms in the normal production to ensure that the titanium pigment is dry fully. This process is through the four valves of temperature control to realize the control of the temperature, and the temperature upheaval problem is through the gradual set point to realize, such as: every minute rises 3 ~ 5 ℃, when it is more than this range, we should immediately stop the process of temperature rise, in order to avoid damage to equipments. In normal production process, it should keep constant temperature, and set a constant set value; when the temperature deviation is not big, through controlling valves' automatic adjustment function to achieve the temperature constant; when the temperature deviation is very big, we should immediately stop the work of filter press and transmission frequency conversion motor.