Abstract: In order to research the vibration impact on Bell Tower in Xi#x02019;an, a subway train-track-tunnel-soil 3D dynamic FE model was created. The influences of train speed on ground vibration are studied in three directions. Results show that reducing speed has obvious effects on controlling ground PPV. The model calibration method with both two positions of input and output is firstly used to study the important historic building against subway traffic-induced micro vibrations after the subway L2 opened to operate. Simulated results of both input impulse and output response match well with the measurements. The calibration model can be used to predict the vibration responses caused by the combined operation of subway L2 and L6. Three different selected routes for the proposed subway L6 are compared. When considering the micro-vibration control for Bell Tower, the route Scheme 2 and 3 are better than Scheme 1.