In the construction of connection section of ventilation gallery and main structure of Metro tunnel constructed by mining method, the construction difficulty of is great and the risk coefficient is high and construction sequence is complicated. Gatetype steel frame support is used. Conclusions drawn are as follows: 1) The construction is simple, quick and with low lost. 2) The ground settlement value is small according monitoring data. 3) It is suitable for granite soil, but not for soil with soft surrounding rocks.