Abstract: The Songhua River Basin in Jilin Province was taken as the study area,and the three Landsat TM/ETM images in 1995,2005 and 2015 were used as the data sources.The landscape pattern,spatiotemporal distribution of ecological vulnerability and its driving forces were studied.The main conclusions were as follows:① Climate change in the drainage basin was different from different periods.The dominant landscapes were cultivated land and woodland,the areas of urban and rural land and grassland were steadily enlarged,but the areas of woodland,cultivated land and waters were in a reduction trend.② The areas with low and moderate ecological vulnerability were dominant in the middle and lower reaches of the drainage basin,and the areas with high ecological vulnerability were mainly distributed in the southeast of the basin,northwest desertified land in the lower reaches,woodland and grassland.③ Ecological vulnerability of the drainage basin was relatively stable and in slight increase and polarization trends.The distribution of ecological vulnerability was closely related to the human activities,and it was related to the topographical conditions to some extent.The effect of climate change was not significant,which,however,could still reflect some ecological problems.

Key words: landscape pattern, vulnerability, spatiotemporal distribution, driving factor, land use, random forest models, Songhua River Basin, Jilin