The relationship between the distribution of complementary assets and the value appropriation of innovator is analyzed by establishment of two-stage Biform game model. The interval preference condition, whose lower bound of value appropriation is replaced by the minimum residual of innovation and the upper bound is replaced by marginal value added, determines the choice of preference for innovator in the first phase of the model. The quantity of innovation product is given, and the value appropriation of the innovator is affected by the total size of the complementary assets, innovation
competitive difference, the number of independent complementary agencies and the total competitive residual of innovation. Furthermore, innovators always look forward to working with the collection of all available independent complementary assets to establish the coalition.