In order to construct objective relatively mapping relationship model between customer requirements and product technical characteristics,a novel approach based on customer satisfactions information digging from case products and satisfaction information of expert technical characteristics was put forward in this paper.Technical characteristics evaluation values were expressed by rough number,and technical characteristics target sequence was determined on the basis of efficiency,cost type and middle type in this method.Use each calculated satisfactions of customers and technical characteristics as input and output elements to construct BP network model.And we use MATLAB software to simulate this BP network model based on the case of electric bicycles. In order to construct objective relatively mapping relationship model between customer requirements and product technical characteristics, a novel approach based on customer satisfactions information digging from case products and satisfaction information of expert technical characteristics was put forward in this paper. Technical characteristics evaluation values ​​were expressed by rough number, and technical characteristics target sequence was determined on the basis of efficiency, cost type and middle type in this method.Use each calculated satisfactions of customers and technical characteristics as input and output elements to construct BP network model. And we use MATLAB software to simulate this BP network model based on the case of electric bicycles.