In order to solve the problem of modal parameter calibration of modal test system, the modal analysis and modal superposition theory are studied. According to this theory, a closed-loop mode signal control algorithm is proposed. The closed-loop system is composed of 5 exciters. According to this method, the numerical simulation and experiment test are carried out. The results show that the calibration method is feasible and can be separated from the concrete modal structure, and the simulation of different modes can be realized.