Bidirectional reflectance distribution function (BRDF) data measurement is an important instrument to acquire information of target surface. The geometrical optics is used to establish theoretic model of laser BRDF. A model is designed to measure the scattering data with lasers, measuring equipments for laser energy density, etc. Under the same measurement condition, the sample and a diffuse reflection plate, whose scattering characteristic is known, are measured together to acquire scattering data of laser pulse. The 3D BRDF data is measured by turning the sample surface and keeping the measurement surface immobile. The 3D angles of measuring positions are computed. The model parameters are optimized using measurement data. The BRDF model of the sample is established. The measuring condition is easily constructed and it has a simple and convenient process. A new way is provided to research sample surface BRDF characteristic.