The eco.environm ental frangibility is studied by choosing the factors of land use class change an d vegetation cover rate.an d the equation of eco.environm ental fran gibility an d its evaluation system are established based on remote sensing fRS、 and geographic information system technology(GIS).Four different years of TM images are selected to calculate land use change grads and vegetation cover rate,and the relationship between the two factors and eco.environm ent frangibility index are build.taking Fuzhou as an example.111e character of times change and space distribution of eco..environment frangibility are described.Th e result indicates the area of eco.environment frangibility increased 2.6% in Fuzhou during tw elve years.an d expan dsfrom the region betw een infield an d forest land to forest land in space distribution