Pyrotechnics deployment technology is widely used in the field of folding wing and folding rudder of missile, the realization of simulated load in the testing process is one of the key technologies.The method of realizing multigroup simulated load by using multigroup cylinders is a relatively new method. The principle and composition of this kind of simulated loader were explained. The factors of mass and swing of cylinder were added into the math model, and programing and simulation calculation were carried out in MATLAB. The results show that through the technology, the simulated loading of multirudder can be realized,and it can simulate large load and take into account the advantages of rapid response of mechanical loading. The simulated loader structure is simple and its cost is low. It has good application prospects and economic benefits.