Abstract: This paper gives the proof that the bending stress intensity factors KⅠKⅡof Griffith crack in the orthotropic plate can be computed by using the superposition principle, and presents the symmetry-skewsymmetry principle with reference to the bending stress intensity factors of Griffith crack in the orthotropic plate. The bending stress intensity factors KⅠKⅡof the Griffith crack in the orthotropic plate for more than ten loading conditions are computed by the application of these two principles, and their general application formulas are also tabulated.