Based on the analysis of collaborative product development process, the overall task load model was established. Through analyzing the features of task iteration convergence and building the design capabilities constraint functions, the design capability reliability evaluation model was constructed to evaluate the conflict between task iteration and design capabilities for each design entity, and judge whether the design entities' capability is capable or not to complete the design tasks on the

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... condition of the task iteration. Based on the assessment results and combined iterative design structure matrix, the main factors which affecting the task iteration was analyzed and corresponding improvement measures were also proposed for the purpose of reducing task iteration frequency and optimizing the conflict processes. Finally, a case study was presented to demonstrate the feasibility and effectiveness of the proposed approach.