In order to study the piled wharf in the influence of earthquake disasters in use process, combination with the engineering practice, based on the numerical simulation analysis technology, the transient dynamic analysis of earthquake under the course calendar piled wharf upper structure crack propagation conditions is analyzed. Based on crack propagation depth and the distribution of crack two indicators of piled wharf upper structure under seismic disasters 4 level security evaluation method, and validated by the crack propagation analysis under different earthquake magnitude. Results show that under different earthquake magnitude 4 safety assessment methods for safety assessment of piled wharf is feasible. To assess the damage to the wharf under different earthquake magnitude, to predict earthquake disasters in advance to the damage degree of wharf, provide a scientific basis for improving design.