Field measurement of train-induced vibration in the whole track-tunnel-ground system is performed for a curvilinear tunnel section of Shanghai Metro line 9 by installing accelerometers in the tunnel, surrounding soil layers and ground surface for the first time. The propagation characteristics of train-induced vibration is analyzed by calculating the averaged acceleration amplitude, acceleration level and dominant frequencies of the measurement points. Measurement results indicate that vertical vibration is dominant in the tunnel (at the near field of tunnel) but the horizontal acceleration can be larger than the vertical when metro train passes a curvilinear tunnel section. Acceleration level significantly decreases from the rail to the tunnel lining while slight increase occurs when train vibration approaches the ground surface. Besides, the dominant frequency also greatly decreases in the propagation.The whole measurement of track tunnel-ground system contributes to knowing the propagation process of train-induced vibration comprehensively, and provides some guidance to the design of metro lines as well as countermeasures for the vibration attenuation of track structure.