Abstract:Refer to the research literature at home and abroad, the research resultsSof R D’s input are reviewed. Based on it, firstly, the evolution regular of input intensity of R D is discussed, and the change trend of global input intensity of R D is analyzed, to conclude the characteristics of input intensity of R D in china, and determine the influence factors of input intensity of R D. Secondly, R D spending in “thirteen-five” period is predicted with combination forecasting model of GM (1, 1) model and trend prediction model, combined with the natural development trend of R D spending. Thirdly, input intensity of R D is predicted with combination forecasting model of trend prediction model and scenario simulation prediction method. Finally, the policy suggestions of ensuring realizing the anticipated goal of science and technology are given by 2020. The results show that, the key factor of affecting the input intensity of R D is the deficiency of government’s input weight of R D. The government R D funds is more than 40% In the world, while the government R D funds is only 20%-30% in china. In “thirteen-five” period, the input intensity would reach 2.6%-2.7%, more than the expected goal 2.5% in 2020, while government’s input scale of R D increase continuously.