Abstract: Experiments with and without fake vanes are conducted using Ty-154 standard model, and the interference magnitudes are acquired. Chimera grids are used in numerical investigation. Through the work of experiments and CFD, the interference mechanisms are studied, the influence of model's breakage caused by the vanes is investigated, and the sting and belly blade support methods are also brought to compare with the vanes. The numerical results coincide well with experiments, proving the reliability of the study method. Due to the vanes' interference, the C_D increase about 0.0005 and a small head-up pitching moment occurs while C_L changes little. The vane support shows apparent advantages over sting and belly blade support in support interference characteristics. Under the Ma>0.9 condition, the vanes' interference increases and becomes unpredictable. The influence of the crack between the front vane and the fuselage as well as the shaft of back vane is small.