In view of the situation that central heating systems have multiple heat stations which are similar in functional structure, optimization design was carried out on the program and variable structure of remote network monitoring system in central heating. Based on the structural analysis, the heat station monitoring system was divided into several different functional units. By using the structural design philosophy, the variables involved in the process were taken asthe function parameters, and four typical control process of the monitoring system were designed as common function modules. In order to simplify the definition and reference of the variables, seven basic variable models were sorted out according to the system’s functional structure characteristics, and optimized in form of structure body. A practical engineering application showed that the use of process function module and structure body can improve the program transportability, lower the development workload, and make the multisubstation monitoring system grow easily.