Complex product conceptual design is a process involving multi-stakeholder, such as consumers, designers, manufacturers, product managers and so on.In order to support multi-stakeholder involved product conceptual design, a conceptual design process was established based on the negotiation characteristics of multi-stakeholder.Combined with experimental design, response surface construction and numerical optimization algorithm,a consistency negotiation method for multi-stakeholder was proposed, and when the consistency negotiation conditions cannot be met, the related adjustment strategies were putward. Finally, from the negotiation process of function consistency，an example of self-help wheelchair was given to illustrate the application of this method.
