Abstract According to the theory of oil-gas micro-leakage,the image model of tone anomaly which reflects the main trend of oil-gas-water distribution can be set up on the basis of relative analysis of TM data and the known oil-gas field,optimum selection of bands combination and image processing.The formation of tone anomalies was related with the type of water accompanied by oil-gas traps and the general mineralization,as well as affected and interfered by landforms,surface,drainage condition of ground water,Quatemary sediment and vegetation.The different surface objects under the same oil-gas bearing condition have different tone indication.The same surface objects under different oil-gas bearing condition also have differernt tone indication.So,the tone anomalies on the remote sensing images are surely ambiguous.In order to reduce the ambiguity of unitary tone anomalies,the image model of linear features-circular structures-tone anomalies of oil-gas traps needs to be set up for the purpose of oil-gas prospecting,using the information of linear features and circular structures on remote sensing images.