With the development for over three years, Growth Enterprises Market (GEM) in China has formed a certain scale. Proper involvement of venture capital is good for the efficiency of GEM mechanism. This article, from the viewpoint of financial behavior, innovatively introduces GHM theory and Shapley Value method in cooperative game theory to build the theory model, and uses Multiple Linear Regression method to prove that the volume of strategic additional investment from venture capital to GEM listed companies is significantly related to target investment scale and business scale. To ensure the reliability of the conclusion, Shapley Value method will again be used to do the further empirical test.