Century’s retrospect and looking into the future of hydrological science

This paper focuses on the issue of the 20-Century's retrospect of hydrological science,and reviews. several important developed stages of hydrological science on hydrological measurements,runoff analysis and calculation,hydrological modeling and forecasting,and main branches of stochastic hydrology, fuzzy hydrology and hydrological system approach. Main problems of present argument,such as the relationships between hydrological science and technology,research and application,and mathematics methods and hydrological physics,are discussed. The paper shows that dilettantism of hydrology in China needs to be attendon. There are opportunities and challenges on hydrological science in the 21-Century of China.