Abstract:With the development of Internet, consumers and enterprises are increasingly to co-create value. However, there are only a few researches pay close attention to the observers who don’t participate the co-creation activities and the past researches focus on the identity similarity between observers and participated customers. This paper considers that the enterprise support in the process of co-creation is also the information source to interpret the co-creation signal. This element inspires the observer to infer the participated customers’ autonomy and competence. Through focus group interview, questionnaires survey, structural equation model analysis and mediating effect test with the Bootstrap method, the paper finds that, the perception of function support and emotion support which was offered by enterprise in co-creation activity has a positively effect on observers’ cognition for participated customers’ autonomy and competence. Meanwhile, the cognition of autonomy and competence is positive related to perceived product innovation and has a completely mediating effect.