A comprehensive seismic evaluation for a middle school teaching building in Shanghai was made.The building, completed in 1983, was designed with an earthquake fortification intensity of 6-degree, which cannot meet the demand for the current code.To insure the safety of the structure, initial data were investigated, on-site test was performed, and then seismic performance evaluation was made.According to the evaluation, it was put forward corresponding reinforcement measures, and the structure achieved the seismic fortification criteria.Which not only significantly enhanced the structural integrity and load-carrying capacity, but also improved the safety of the structure.