One Landsat 7 ETM+ SLC-off data of the study area on August 18,2005 was downloaded from USGS website for forest cover classification. This data was selected because ofmany land cover products were provided in 2005 and the clas-sification result could be compared with the existed products.Furthermore, the vegetation in August was at exuberant growthstage in this study area and the ETM+ data was nearly not affectedby cloud. For the scan-line corrector of the Landsat 7 ETM+sensor failed in 2003, it was resulted in about 22% of the pixels perscene not being scanned . To fill in the data gaps, another Landsat data in August 21, 2006 was downloaded from Global Land Cover Facility Website of Maryland University. The data gaps was filled using the method