The evaluation method, model and process for the flood and waterlogging disaster condition by GIS,RS and GPS technology and the method for setting up d isaster condition database, dyke database and historical disaster damage databas e are presented. An index of flood damage degree(FDD) used to evaluate the relat ive degree of disaster loss and divide flood and waterlogging area is suggested . The value of flood damage degree can be calculated as follows :taking the vari ous disaster losses of sample area in a base year as standard value and computin g the ratios of various disaster loss values in different areas and years to th e standard flo od disaster loss values, then summing up the weighted ratios. The computed resul t s are the value of flood damage degree in the every year. The macroscopic flood disaster distribution can be evaluated by the values of flood loss degree.
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