Based on the flex-rigid coupling dynamics theory, the flex-rigid coupling dynamics model was built using the software LS-DYNA. The problem of transient collisions when folding-wing deploying to expected position was analyzed. The dynamics process of the partial contact impact was numerical simulated by establishing the contact model and joint between the different parts mainly. The model method properly obtains the dynamics response of folding-wing, and the impact characteristic of folding-wing was acquired. The stress distribution could be gained in the process by the method. The result can be used for the design of the folding-wing.