Taking the Malutang super large bridge of Yunnan Tianbao Houqiao expressway as the engineering background, this paper sets up a bridge to cross the Malutang reservoir, comprehensively considers and analyzes the design and construction difficulty, construction period, landscape effect, maintenance operation and other factors of the bridge type scheme, and compares and selects the cable-stayed bridge, suspension bridge and concrete-filled steel tubular arch bridge in the preliminary design, Finally, the bridge type scheme of double tower composite beam cable-stayed bridge with main span of 480m is determined.