This paper presents the dynamics-simulation and research of vibration characteristic on deep-groove ball bearing. It introduces an analysis of the vibration frequency in different damage of bearing and spectrum analysis of the fault signal on bearing to draw response on vibration characteristics in bearing, so as to provide a simple method on research of dynamic fault characteristic of bearing. This work shows some kind, characteristics signal and frequency of fault on bearing. The normal model and other two models which have raceway crack in inside track and out ring are set up by using ADAMS software to analyse the dynamic of them, the test program that vibration signal of three models are obtained by acceleration sensors to instead of that of real condition is simulated. In addition, the test signal of vibration is given in time domain respectively, and the vibration characteristic is identification by using spectrum analysis method, so that it can provides technical support for diagnosis of fault bearing. In the study of fault diagnosis, several experimental results provide that the uncertainty of fault diagnosis and interference of other complicated factors are avoided effectively in real environment. The result of simulated analysis is consistent with the theory calculation. This method is more effective, convenient and expansibility than a research of practical fault-diagnosis.