Flood disaster is one of the world′s main natural disasters.The study of vulnerability assessment is greatly helpful to regional flood control.After considering natural conditions,socioeconomic situation,and disaster prevention/reduction measures in the 13 districts of Tianjin region,a flood vulnerability assessment index system was firstly established.In order to reduce the subjectivity in the assessing process,a combination idea was adopted to optimize traditional comprehensive assessment model and then assess the flood vulnerability in the region.Results from the assessment showed that Tianjin region was overall in a high level of flood vulnerability and vulnerabilities in different districts had significant difference.For all the assessment units,Tanggu,Hangu,Ninghe,and Dongli districts or counties in the eastern area of Tianjin region had the highest flood vulnerability.This conclusion may provide a theoretical support for Tianjin region to formulate economic development planning and carry on flood control works.