Abstarct: In this dissertation, modeling and a dynamic analysis of twisted string actuator system has been conducted. For this matter, the string has been considered as a continuum object, and then its dynamic motion equations have been yielded. In this case, it is presumed that the wire rope material is viscoelastic. In this modeling, the aforementioned equations type is PDE (partial differential equation) which have been solved via FDM (finite difference method). Moreover, in order to develop accurate dynamic behavior of twisted string, the system has been simulated by Abaqus software. In this study, in addition to steady-state results of the twisted string, the results of transient state have been provided as well. Also, a way of proper motor selection for the wire rope has been introduced.