The reason why Chinese ancient science and technology hadn’t developed into modern science was that the self-sufficient economy hampered the development of merchandise economy and caused the lack of motivation of science and technology development. The centralization political system, the policy focusing on agriculture instead of business and the trend of officer’s basis also hampered the progress of modern science. The Chinese traditional way of cognize had got comparable brilliancy in earlier period which the science was not very complicate. But the modern science became more and more complicate so that the original mode of thinking would not keep up with the development of science.