Abstract:Based on the Chinese manufacturing data from 2011 to 2013, this article systematically examines the influence of financing constraints and tax preference on the R & D of Chinese local firms. Through the theoretical model, this paper analyzes the mechanism of financing constraints and tax preference alone and commonly influences the R&D of Chinese local firms and uses data to test. We find that financing constraints is an important factor in the impact of R&D investment, and that the R&D investment of private firms is mainly dependent on debt,but the state-owned firms rely mainly on equity; Tax policy is an important factor in the impact of R & D investment of private firms; The impact of tax policy on R&D investment of private firms is more significant than financing constraints, enterprise income tax incentives bring more R&D investment than added-value tax do.