报道了激光诱导热效应光栅自衍射效率与两入射激光束夹角的依赖关系。实验结果给出自衍射效率与夹角的四次方成反比，理论分析与实验结果一致。 The dependence of the self-diffraction efficiency of the laser-induced thermal effect grating on the included angle of two incident laser beams is reported. The experimental results show that the diffraction efficiency is inversely proportional to the square of the angle, and the theoretical analysis is consistent with the experimental results.