Semi-infinite normal tissues embedded a heterogeneous layered tissue is chosen as the simplified tissue model of local-pathological-changed tissues. Based on the model, double-adding method is introduced to calculate the angular distribution of backscattered light from local-pathological-changed tissues. According to the numerical calculations, the effects of geometrical and optical parameters of tissue models on the angular distribution of backscattered light are analyzed comprehensively. It is concluded that the variation of light intensity originated from local-pathological-changes tissues highly depends on the exit angle of backscattered light——the variation of backscattered light with small exit angle is much more obviously than that of backscattered light with large exit angle. The results also show that the angular distribution of backscattered light is much more sensitive to the geometrical parameters than the optical parameters of pathological-changes tissues. Finally,the angular distributions of backscattered light applied in diagnosing the abnormal object hided in normal tissues.