The purpose of the paper is to develop a model to assess the vulnerability of land ecological system combining the disturbance index and the response capacity index, and further analyze the spatio-temporal change of land ecological system in a resource-exhansted city. Methods of set pair analysis, landscape pattern indices, RS/GIS were employed. The results show that the land ecological disturbance index increased from 0.449 to 0.546, and ratio of oil & gas output to scale industrial output is the dominant factor. Meanwhile the response capaci...