The morphology of in situ heated and stockpiled TATB-based explosive (TBE) was characterized by atomic force microscopy (AFM). The AFM images were analyzed by a fractal method and conventional methods. ne result of the fractal analysis indicated that in the thermal process of TBE the binder chains were gradually activated with increasing temperature and resulted in a spread of binder and a decrease in the fractal dimension of the surface. The crystallinity of the binder increased with extending time above the glass transition temperature (T.), which caused the surface structure dimension (D-f) to be more complicated.