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In order to analyze characteristics of Cobot cooperation with a human in a shared workspacce, the model of a non-holonormic constraint joint mechanism and its control model were constructed based on double o-ver-running clutches. The simulation analysis was carried out and it validated passive and constraint features of the joint mechanism. In terms of Cobot components, the control model of Cobot following a desired trajectory was built up. The simulation studies illustrate that the Cobot can track a desired trajectory and possess passive and constraint features; a human supplies operation force that makes Cobot move, and a computer system con-trois its motion trajectory. So it can meet the requirements of Cobot collaboration with an operator. The Cobot model can be used in applications of material moving, parts assembly and some situations requiring man-ma-chine cooperation and so on.