The paper discusses the deficiency merit of the client/server mode, designs the system frame of the Reasonable Allocation System of Local Water Resources Based on Browser/Server Mode, expounds the theory and application of the ASP, COM , Web GIS, Socket, transaction processing and etc.. On Web GIS, the system realizes many functions, such as patial integrated information processing, long-distance collection of information, water demand calculating and forecasting, water supply calculating, supply and demand analyzing, the evaluation of different schemes, long-distance interaction and etc..