A measure method for laser mirror scattering in the visible region and its results are described in this paper. The measure errors have been analysed and some of them may be reduced by ±15%, which is cooresponding to ±1.5×10-4(absolute deviation) for the 1×10-3 scattering. The measurement results are easentially in agreement with theoretical calculation and the practice. It shows that the 21-layer λ/4 TiO2-SiO2 hard-film scattering of laser mirrors is generally 5×10-4~2×10-3. The fluctuation of scattering is great, and the mirrors reflectivity is governed by scattering in principle.