Abstract:Considering the economic characteristics of firms which act as the main body of innovation system, the fundamental way to solve the dilemma of collaborative innovation is to study the lack of willingness to share knowledge of collaborative innovation among firms based on market factors rather than social factors. Firstly, according to the theory of rational behavior and motivation, the conduction model is constructed, which reflects the influence of market factors (market structure, initial market demand, market growth potential) on the willingness to share knowledge of collaborative innovation among firms. Secondly, the allocation ratio of synergistic innovation revenue is used as an alternative variable of market structure. Based on the demand function, the conduction model is transformed into a mathematical optimization model. The results show that: (1) under competitive market structure, there is a U-shaped relationship between initial market demand and the willingness of knowledge sharing in collaborative innovation among firms, while under monopolistic structure, there is an inverted U-shaped relationship between the two. (2) under competitive market structure, if the initial market demand is small, the market growth potential is negatively correlated with the willingness to share, otherwise it is positively correlated; under monopolistic structure, if the initial market demand is small, it is positively correlated, otherwise it is negatively correlated.