School buildings in Syria suffer of the high cost of maintenance works. In addition, there is no fear methodology to organize the maintenance process and evaluate the performance of these buildings. This research aims to develop a system for evaluating the performance of school buildings in the city of Tartous, in order to be used in the maintenance policy for these buildings and other buildings in other regions. The evaluating process is executed by calculating a performance indicator, which defines the state of the building depending on three sub-indicators: functional, technical and healthiness indicator. Maintenance manual and evaluating lists were developed to evaluate the components of school building. In addition, many questionnaires were set to determine the relative importance for each component of school building. The improved model was used to calculate the performance indicators for several schools. As a result, most of these schools were in a moderate situation. Also, the results clarify that some components have law state comparing to other ones and we should focus on them in organized maintenance processes.