As the elderly or lower limb fractures in patients with long time can not exercise and lead to quadriceps can not force the situation, so the need for rehabilitation of quadriceps femoris. Therefore, this paper combined with interactive robots, designed a set of sitting to reinforce the quadriceps of the auxiliary equipment. The accessory consists of two modules, the bending sensing module and the robot module. The healer wears the bend sensing module we designed at the knees to detect the rehabilitation movement of the healer and straightening. At this point, the rehabilitation of the use of lifting the foot of the rehabilitation action to control the robot forward, and the robot module fun fighting to achieve the purpose and effect of rehabilitation.