Abstract:Interpretation of land cover types by using two Landsat-TM image data before and after the Wenchuan Earthquake through the fuzzy object-oriented classification，at the same time, analysis the land cover temporal-spatial patterns and the changing tendency of the study area by using applied statistics methods and the index of landscape. Results show: ① Extracting land cover types of research field by object-oriented classification; precision is comparatively exactitude and efficiency. The total precision of Post-quake and pre-earthquake respectively are 0.90 and 0.92, while Kappa factor are 088 and 0.90. ② Forest in research field degenerated dramatically. The area of forest reduced 35679.76hm2, accounting to 7.66% of the total area. Desertification trends are obvious, After the earthquake impervious surface increased to 6793541hm2 from 24558.61hm2. And relative dynamic degree reached 35.82%. ③ After the earthquake, land cover fragmentation tends to rise and number of patch largely increased. Impervious surface which changes the most severely among all the land cover types increase to 539 from 240 in Post-quake; forest have also been doubled to 335. CONTAG of the research areas is 31.09 and comparing to Post-quake′s data decrease 9.80. The results show that earthquake intensifies the patch fragmentation of the research areas and leads to the degree of dispersion between patches expand. Accordingly, landscape degradation and spatial patterns evolution result in ecological deterioration and regional ecosystem service function decline.