Decision-making meteorological service system for flood prevention of Hubei province collects or displays the hydrological and meteorological information of great weather processes and the information of river,lake and reservoir′s flood prevention.It can also provide products of drainage area hyetal statistics and forecast,and give the decision making service of flood prevention for all government departments and flood prevention department.The system structure,main function designing,software realizing method of the decision-making meteorological service system for flood prevention of Hubei province and its testing results were also introduced.