| Product innovation becomes more and more vital and imperative for modern enterprise resulted from the intensive market competition, as well as technology development. Conceptual design is the important phase of product innovation, and the designer is a decisive factor to the innovative quality of design scheme. However, the present researches on innovation performance predominately focus on organization, rarely on individual. And the research methods applied to individual work performance are not competent for individual innovation performance. Based on the systematical analysis of the research fruit of organizational innovation performance, individual work performance, creativity and design cognitive process, this paper deeply study the influencing factors of individual innovation performance of product design (IIPPD). This paper includes the following contents:Firstly, the clear definition and connotation of IIPPD has been clarified based on the discussion on performance, and the measurement dimensions of innovation quality and design time of scheme are prescribed to scale IIPPD. In the light of the viewpoint of 4M1E from industrial engineering, establish an index system of influencing factor orienting IIPPD, by integrating the engineering characteristics of product design of the research fruit of creativity in psychology. In the index system, the information abilities as well as the abilities that individual find problems, are highlighted, instead of individual intelligence and thinking style. This system takes more engineering characteristics in consider, and make factors measurement and evaluation more feasible.Secondly, widely researched and concluded the evaluation methods applied to product scheme design. Aimed at the deficiencies of these methods, plot out and defined the product parameters to be improve in scheme, in the view of product life span instead of use stage. The innovativeness of scheme has been divided into H class and P class, of which judgment criteria were provided as well. Thus, an innovation quality of scheme oriented evaluation method with general applicability, completeness and feasibility has been present.It is considerably difficult to measure the internal factor of individual influencing IIPPD because of qualitative data. To solve this problem, a measure model of influencing factors of IIPPD has been built up. In this model, problem-finding abilities are scaled by the amount of the problem that designer take into account, the indiscoverability of problem, goal deviation. And information abilities are scaled by the innovation quality H class.The cognitive process of participants is not able to be observed, and problem- solve process usually take place out of experimental condition. Aimed at the problem of experimental data collection, the method of stage activities measurement (SAM) was provided. Following this method, experimental task is divided into five stages, namely problem analysis, strategy conception, solve approach seeking, scheme making and self evaluation. Participants were asked to write down their spent time in each stage and the knowledge points referred. In this way, experimental data is collected effectively and the forgotten cycle is reduced to a great extent. To reflect the influence resulted from innovation method or tool, a product innovation knowledge base was developed. Latin square was used to design experiment, familiarity of task was taken as variables between blocks, task indefiniteness was taken as factor level.In the end, experimental study was conduct to test influencing factor model of IIPPD. The experiment results indicated, familiarity and indefiniteness of task had not significant influence on IIPPD, information abilities and problem-finding abilities were very important, and designers with high information abilities had also high problem-solving abilities, the factor of personality had not significant influence. Based on the test results, the model of influencing factor of IIPPD was revised.
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