Research conclusions: If the support of cable-arch structure is elastic, the distance from the cable to the arch is equal to 0. 6H and section of arch is杯50 x 25，the cable-arch structure has a better comprehensive mechanical performance, and there is little influence on the mechanical property of cable-arch structure when choosing two different cables. Properly increasing the initial tension is beneficial to the mechanical property of cable-arch structure under upward loading. In a word, the mechanical property of cable-arch structure under downward loading is reasonable. But if the loading is upward, the bending stress of the arch becomes large and the horizontal reacting force on the support increases, resulting in the deformation of cable-arch becoming large and the cable relaxing. However, it can be controlled with more reasonable support type or increasing the initial tension.