Holographic stereogram receives much attention in autostereoscopic display with large scale and wide field of view (FOV). However, its property of FOV is constantly restricted by optical elements used in recording step. After analyzing drawbacks of the available methods nowadays, a novel method of edge-in reflection optical element for overlay projection is proposed. The feasibility is confirmed by optical simulation. And property of manufactured reflection surface has also been tested. Then it’s been used to generate horizontal-parallax-only stereogram. The final holographic stereogram with 73 degree viewing angel range is acquired.