Abstract: In order to study the seismic performance assessment method of brick masonry structures with precast slabs，the bi-directional pseudo-dynamic test of 1∶ 2 scaled building model was carried out． The change of rigidity and frequency of the structure was introduced in the test，and a seismic performance assessment method based on frequency was presented． The evaluation results based on frequency were very close to those based on rigidity，and frequency-based method had a simpler calculation process，and the results were also closed to real damage condition． Therefore，the frequency-based method could be applied in seismic performance evaluation of brick masonry structures with precast slabs．