The land yard of Huashan wharf project of Wuhan Port is located in railway line area. To investigate into the influence of dynamic compaction on adjacent railway bridge, hence determining a reasonable compaction technique, we analyzed the relationship between tamping energy, tamping number, tamping distance and railway bridge vibration according to field compaction test.In field test,the vibration velocity of bridge floor converged to 3.5 cm/s when dynamic tamping energy was 4 500 kN·m after tamping number reached 5; the vibration velocity of bridge floor was smaller than 4.0 cm/s and vibration frequency less than 10 Hz when tamping energy amounted to 6 000 kN·m beyond 40 m, which meets the requirements of Standard for Allowable Vibration of Building Engineering. In addition, the equation of vibration velocity attenuation of buildings caused by clayey foundation compaction was deduced based on test results for reference for similar projects.