Severe impact is detected in the application of deployable hinges in aerospace mechanisms such as solar array. The impact may result in failure of accessories connected to the hinges. To tackle this problem, this paper firstly proposes an approach to calculate magnitude of angular velocity and impact torque, based on which the key factor affecting the impact is concluded. Two schemes are devised based on intermittent mechanism and energy-storage mechanism. The effectiveness of the schemes to decrease the impact is discussed from the view of energy. Two structure models are built for each scheme and simulated to verify their feasibility. The simulation results indicate that the impact torque can be reduced by approximately 90% and 31%, respectively. In addition, two prototypes are manufactured, on which experiments of angular acceleration measurement are conducted, and the results demonstrate that the impact can be diminished by 95% and 40%, respectively.