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A novel strategy of online force distribution for multi-finger robot hand is developed based on impedance control. The real-time controller system including the finger dynamics and multi-fingers constraints is considered as a nonlinear system. Because when the robot hand grasps the object, the fingertip force is usually changed which could cause the grasp unstable. Our method gains the ability to deal with online grasping force distribution and can satisfy the real-time requirements at the same time. Experiment shows that our method provides the most feasible grasp configurations in real-time performance.