Some preliminary results for the study project are described in this paper, for which the remotely sensed data such as the Landsat TMimage is used into the porphyry copper mineral exploration in the eastern Tibet, since the elevation of the region is very high and unaccessable by the conventional methods. In addition, there is a big potential for the copper exploration and several huge porphyry copper deposits have been, so far, discovered there. It is shown from the conventional geologic data that the mineralization of the study area is clearly controlled by the volcanic formation in the Tertiary and related closely to the immediate- felsic porphyry introsives in the Himalaya Movement. However, the results of the interpretation and analysis for the Landsat image revealed that the major mineral deposits are located in circle structures that are almostly the calderas developed in the Later Tertiary. Meanwhile, digital image processing with the Log-Residual, Mineral Indices and HSI Transformation algorithms have been also applied in this study in order to enhance and extract the alteration information related to the porphyry copper mineralization with the Landsat TMdata and most of them are correspondence with the circle structures to be found from the visual interpretation of Landsat TMimge. Then, some target areas for the mineral exploration in the study area are delineated on the base of both the circle features and the alteration information to be mentioned above.