The greatest limitation of the shadow moire method is that when the sensitivity becomes high to microns, the visibility of the moire pattern is very low due to the Talbot effect. For high sensitivity and reliable deformation measurement, it is necessary to increase the Tabot distance of moire pattern. In this paper, experiments for various experimental conditions were performed, and the change of the visibility and the Talbot distance of moire pattern were evaluated The experimental results show that the visibility and distance of the moire pattern are affected not only by the sensitivity and incident angle of the moire condition but also by the observation angle. The moire pattern for the reference grating, the light source, and the distance L of the camera was not significantly affected by the measurement of slope of the speciment, but the slope was found to be significantly larger as the distance Z between the reference grating and the specimen increased.