激光引力波望远镜的杂散光来源主要是细光束入射到镜面产生的反射杂散光。1 W的激光入射产生的杂散光需抑制到10-10 W以下，否则将严重影响主要参数光程差的测量精度。针对该应用背景，考虑了在细光束入射到镜面条件下由杂散光测试数据重构表征镜面反射特性的双向反射分布函数(BRDF)参数的可行性。传统方法测量BRDF需要4个转角，系统复杂不便于实时应用。为此基于光学元件各向同性和镜面杂散光模型的对称性，综合考虑了平面镜、曲面镜以及光束衍射效应、测量误差等因素，提出了一种仅利用子午面内一维测量若干个点的散射数据即可重构得到BRDF参数的方法，并用数值方法对其可行性和测量精度进行了验证。

The source of stray light of the laser gravitational wave telescope is mainly the reflected stray light generated by the thin beam incident on the mirror surface. When the laser light intensity of 1 W was incident, the stray light intensity needs to be suppressed to less than 10-10 W, otherwise the measurement accuracy of the main parameter optical path difference will be seriously affected. Aiming at the background of this application, the feasibility of Bidirectional Reflection Distribution Function(BRDF) parameters for mirror surface reflection characteristics reconstructed by stray light test data was considered when the thin beam incident on the mirror surface. In the traditional measurement of BRDF, four corners were required. The system was complex and inconvenient for real-time application. Based on the isotropic optical elements and the symmetry of mirror stray light model, considering the plane mirror, curved mirror and beam diffraction effect, measurement error and other factors, a method reconstructing the BRDF parameters by one-dimensional measurement the scattering of several points with the plane mirror rotation in the meridian plane was proposed, and the feasibility and measurement accuracy were verified by numerical methods.