Research conclusions:(1) In the section between Luohu and Grand Theater of Line 1 of Shenzhen metro，it was the first time in China to use the right track and the left track with the arrangement of the up － down overlapping． (2) Compared with the traditional arrangement，such track overlapping arrangement could reduce the space occupation by 25 － 50% and enhance the freedom of the track alignment to solve the problem of the track laying in the crowded space． (3) The lateral space was occupied least by using the track overlapping arrangement and it effectively kept away from the building foundation． (4) If the three － storey side station was used，it was inconvenient for the station management and passenger travel and made the gradient in the track switching section having the " scissors difference" with the big gradient of the right and left tracks and it was unfavorable for the operation． (5) The switching section was inappropriate to be over long because of the complicated line－shape and difficult construction． Otherwise，after service，the tunnel settlement would happen because of the liquefaction of the soil between the tunnels． (6) When designing such track，the attention would be paid to the track ＇s buried depth，parallel and overlapping switching sections，switching section and difference in elevation between the tracks in the overlapping section，and the communication and cooperation would be conducted between the persons of the architecture and tunnel closely to achieve the economic benefits and reduce the construction risk．