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As a water resources defiency country��the water security in China has been concerned extensively�� It is very necessary to understand the composition condition of per capital water resources and its development situation�� Using surface water and groundwater data in China from 2000 to 2007��the authors conducted regression model analysis and state-space model prediction to per capital water resources��and calculated the effect of surface water and groundwater to per capital water resources and its variation with time�� The per capita water resources decreased substantially��but the amplitude of decrease was reducing by simulating the effect dymatic of surface water and groundwater to per capita water resources��which indicated the recent water resources management was effectively in China��