In order to improve the understanding of the mechanism of h type anti slide pile to reinforce the slope, this type of anti slide pile with different anchorage depth and distance between fore pile and back pile was investigated through model test by specially designed experimental apparatus. The test results indicate that the distribution of resistence and thrust acting on fore pile is triangular, and the resistence acting on back pile is rectangular. For the landslide thrust acting on back pile, there are three types of distribution: parabolic, parabolic with upper center of gravity and rectangular. Therefore, when the calculation pattern for the part of h type pile above the potential slip surface is defined, the distribution of resistence and thrust acting on fore pile can be fixed as triangular, and the resistence acting on back pile can be fixed as rectangular. Whilst the distribution of landslide thrust acting on back pile should consider the influence of property of soil, anchorage depth and the distance between fore pile and back pile. Some conclusions drawn from this test can provide useful reference for the design of h type anti slide pile.