The invention discloses a combined structure design scheme capable of achieving a complementary effect and involving a haze treatment project and a stereo garage project. The combined structure designscheme is characterized in that according to the design scheme of a project combination which can save land and enhance the seismic strength, a leading part, consisting of a highest vertical rectangular airflow large-diameter and long exhaust passage (1a), in the haze treatment project is a component part on the ground (D), the stereo garage project consisting of elevator shafts (4) and arrayed parking spaces (2) is another component part on the ground (D), and the two component parts are combined to form a combined project structure; and the long exhaust passage (1a) is connected with an underground gas passage (1b) at the lower part of the ground (D), wherein the underground gas passage (1b) is provided with a haze inlet (R) at another place on the ground (D), and in addition, at leasta series of haze removal purification treatment devices (W) and exhaust fans (F) driving gas to flow are arranged in a total gas transmission passage formed by the long exhaust passage (1a) and the underground gas passage (1b). The combined structure design scheme is suitable for the implementation in urban or urban lively areas.