Based on the climatic data of Puyang,Henan and the data of flood disaster during 1995-2004, the spatial and temporal characteristic of flood dis aster and the urban economical loss were analyzed. By using regression analysis, weighted average and parameter statistics according to the rank and type of res ources, the assessment steps and technique of flood disaster loss are discussed, and a quantitative assessment model of urban disaster loss was established. The feasibility of the model was validated by analyzing flood cases during 2005-200 6, one of which was a typhoon precipitating process on July 22-24, 2005 with pre cipitation amount of 215.9mm. The result indicates that the quantitatively calc ulated loss of flood disaster is quite agreement with the statistics of flood di saster loss investigation. It shows that the model can quickly and accurately ev aluate the loss of flood disaster. Meanwhile, the technique is feasible and oper ational, and is valuable for the authority to prevent and mitigate the flood dis aster.