Abstract: The containerized edge data center (CEDC) is one of the critical components of the 5G communication network. Accurate assessment of its functionality level under earthquakes with various intensities is the foundation of post-earthquake functionality assessment of the communication network. Taking a typical CEDC as the research object, a probabilistic-based method is developed to evaluate its post-earthquake functionality. The critical components of five subsystems of the CEDC were recognized and the functional logic relationship between these components were analyzed. Then the fault tree model of each subsystem and the state tree model of CEDC were established. The seismic fragility parameters of each critical component were given based on previous literature or supplemental analyses. Seismic functional fragility curves and parameters of CEDC were calculated by combining the state trees with Monte Carlo simulation. The results indicate that the indoor and outdoor units of air conditioning, and battery cabinet are the most vulnerable parts of CEDC. Enhancement of these parts can significantly improve the post-earthquake functionality level of CEDC.