Abstract:Aim at bridge damage assessment the vagueness of goal and influencing factor, the fuzzy synthesize assessment method in fuzzy mathematics is applied ,through building model, grade, determine different levels factor region and weight, reach different levels appraisement vector . Bridge overall structural damage degree is decided. Final basis is the biggest subordinate principle and asymmetrical keep close degree law two methods to evaluate bridge impairment scale. Since application the actual assessment of Qinghong bridge in Daqing city proves that this assessment method is reasonably feasible.