<p>Because a person is united with an assist robot as for the index to evaluate the feeling of wearing and the usability of the walking assist robot, the quantitative evaluation is difficult. In this research, walking movement with or without an assist robot is measured by a motion capture system and force plates. The details are reviewed by using open-source musculoskeletal simulator "OpenSim" from walking data. The influence on a person with or without assist is inspected and the assist for effective walking assist control was evaluated.</p>