Forestry investment is potentially effective way for enterprises to fulfill their social responsibility. Based on the analysis of connotation and realization mechanism of corporate social responsibility, the paper points out that the coupling of forestry investment and social responsibility is embodied in the comprehensive benefit and social responsibility connotation of forestry investment, and the consistency between forestry investment and social responsibility investment. The results show that the ecological and social benefits of forestry investment are far superior to economic benefits. It is proved that forestry investment is a feasible way for enterprises to fulfill their social responsibilities. The paper analyzes the forestry investment patterns of different enterprises under the social responsibility fulfillment, and points out that the forestry enterprises can participate in the investment projects matching their strategic social responsibility and forestry core social responsibility. Non-forestry enterprises can participate in the business based on the social responsibility investment idea forestry investment projects, and invest in public welfare forestry projects based on responsive social responsibility inputs. It is suggested that the government should improve the social responsibility system construction and strengthen public opinion propaganda to guide forestry and non-forestry enterprises to increase forestry investment by innovating forestry management mode.