It is a study on the development of a vibration ripper which is a next generation excavator that can increase the working efficiency of hydraulic breaker in excavation works at construction sites and mines. In order to develop the flexible multibody dynamics model of the vibration ripper, the reliability of the flexible model development has been verified through the mode analysis and the test comparison of the weak housing.As a result, it can be used as a load prediction model for each link and housing with respect to the load generated during the operation of the vibration ripper.