Abstract: According to the actual construction of metro lines in mountain city, firstly a dynamic model of metro train-route and a load model for Chinese Hat Gust are established, and the operation safety evaluation index are determined. Then, the basic characteristics of train passing curved section under gust are studied, the curve radius and wind speed safety limits for metro train operating safely under gust are obtained by calculation. The results show that crosswind load reaches the maximum value when the wind attacking angle is around α=90°; the first vehicle is most sensitive to the impact of gust; increasing radius may contribute to safety improvement, and under preset conditions, the radius should be no less than 840 m; increasing wind speed may worsen the safety, and under preset conditions, wind speed should be no more than 17.5 m/s to maintain the safe operation.