The color change phenomenon of 1,3,5-triamino2,4,6-trinitrobenzene (TATB) has puzzled the energetic researchers for decades. Many efforts have been dedicated to identifying the "colored TATB", however, hardly any of wellestablished evidences have been ascertained. After detailed reviewing the literatures, we herein propose a new insight to survey the coloration of TATB. And a 3D photonic crystal model has been proposed to elucidate the color change phenomenon of TATB. Coloration behavior of the TATB is confirmed by home-made TATB thin film. It is proved that the coloration of TATB is a physical appearance, structural color.