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Constraints conflict occurs inevitably in collaborative design process. Therefore, conflict detection and resolution becomes critical for successfully completing the design. This paper puts forward a novel process of constraints conflict visualization to help designers to solve the problem. The process begins with modeling of constraint information based on constraints satisfaction problem (CSP), then presents an effective algorithm to detect conflicts, finally the visualization of constraints result is displayed to designers for pointing out the direction of conflict resolution or personalized improvement. At last, an application of V belt drive design is described, which demonstrates the reasonableness and feasibility of the proposed technique.