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According to the 100m2 double-line tunnel cross-section which is generally used in high-speed railway of China, this paper develops a tunnel - air - train simulation model, based on the three-dimensional incompressible Navier - Stokes equations and the standard k - ε turbulence model. This model can simulate two situations one is that a single train runs through a tunnel normally while the other is that another train runs beside a train parked in the tunnel. Time-history variation rules and space distribution characteristics of train wind are studied respectively at 120 km, 200 km, 250 km, 300 km and 350 km per hour. Furthermore, the authors discuss train wind influence on personnel safety on evacuation passageways. In addition, the authors give out analytically the results of the numerical simulation. The results show that: Train wind is complex three-dimensional flow changing with time and space, so people should avoid activities at dangerous time and places; since personnel safety may be threatened by train wind in the two situations above, therefore, effective measures should be taken to avoid accidents. [ABSTRACT FROM AUTHOR]