The paper give a brief account to the research on Hydro science in the world

and the research on hydro science of geograpical category in China.The forward part introduce:(1)The hydro science has came into a system

and it was composed of the hydrology (pure science)

engineering hydrology (applied science) and water resources (applied science) 3 coures.(2)The research plan and research subjects of Internation IHD (1965～1974) and Internation IHP (1～IV

1975～1995).The hydrologic study subjects of the importance countries in the world.The last part introduce:(1)The 3 national hydrology society in China.(2)The 5 chief study works on the hydro science of geograpical category recent 40 years in china:① The study of the variances of water resources effects by the different geographical environment (includ the humam activities).② Research for hydro geography and regional hydrology.③Research for water cycle and water blance in china and each province.④Research for estuary

and.⑤ Research for water resources and hydrologic enviroment.