Abstract: Employing Central-difference method successtfully and adopting MTS Toolkit routines reasonably,the paper has completed a control program on uni-directional Pseudo-dynamic test of multi-degree-of-freedom elastoplastic system.It holds the characteristics of dialog,software interruption,and convenient manipulation,etc.The hysteretic loop of load VS.displacement or the time history response of displacement,Velocity and acceleration which result from test can be directly plotted by the program.Pseudo-dynamic test is carried out by step-by-step com- puting and loading,and it takes only 200 seconds to go through.G₃ ground acceleration waveform.It may be called quasi-dynamic test.