Laser paper packaging material is of metallic luster and Avision effect. The existence of the special optical effect makes it difficult to measure the printing color of laser paper surface. The effects of different factors on measurement precision stability of laser paper under diffuse lighting conditions were studied. The results showed the different placed angles of measuring instruments would influence the measuring precision, and the effect is greater than the white cardboard and aluminum plated paper. The measuring accuracy varied with different test points. By taking average value of multiple angle measurements, the comparability of color measurement results at different test points could be improved. The measuring instruments with different accuracy would also affect the measurement accuracy of laser paper, namely the higher the accuracy of the instrument, the more stable of measurement results.