The structure of High-speed vehicle is complex, though simulation to obtain structural properties on the current computer simulation is still difficult.Modal testing is used to obtain dynamic characteristics of the structure. This paper describes a test method for structural characteristics, and its realization of the basic algorithm. Multi-excitation method is to be used and the measuring point for the minimum non-resonant component of the objective function of the adjustment force method is to establish. Simulation results show this method is simple, less post-processing work,and high reliability.