The construction of mined Metro ventilation gallery with large crosssection, double storey, double span, flat roof and upright wall has such features as relatively large excavation span, complex temporary support system and complex loadshifting of the secondary lining structure. Taking the construction of the doublestorey section of No. 1 ventilation gallery of Shiliuzhuang Road Station on Line 4 of Beijing Metro as example, the authors summarize the key construction technology for the ventilation gallery with large crosssection, double storey, double span, flat roof and upright wall in terms of central drift excavation method, load shifting and sectionbysection construction of the insitu cast concrete lining. The project practice shows that the construction plan is reasonable and feasible.