According to the characteristics of many control points, requesting high stability and reliability about a temperature control system of baking barns for a preserved fruit production line, a temperature control scheme based on protocol macro is presented. This paper introduces the realization of the control scheme from system structure and communication programming in detail. The scheme improves the programpsilas operating efficiency and enhances the system stability and reliability. The experiments show that the system cuts the maintenance expenses of the equipments and provides an obvious economic performance for the enterprise.