The transfer design of underground twofloor doubleline metro tunnel with same platform is characterized by high cost, large space waste, limited transfer proportion, multiple intersections in front and back of the station section, inconvenient crosspassage setting and high construction risk. Hence, 3 schemes of different spacings between right central line and left central line, 5 m, 9 m and 12 m, are put forward and compared, in which the spacing of 12 m is the optimum and can be used as equipment room or transfer platform; meanwhile, rational layout scheme of right line and left line should be determined according to the actual transfer passenger flow. The case study results show that by adopting the abovementioned scheme, the sections ahead of and behind the station can be bored by shield, no vertical connection gallery should be constructed, the length of opencut station can be shortened, and the cost, atgrade intersection of section and construction risk can be reduced; the transfer proportion can be increased by adding transfer platforms.