3D reconstruction technology depicts the real scene into a mathematical model that conforms to computer logic expression through the process of depth data acquisition, preprocessing, point cloud registration and fusion, and surface generation. This model can play an auxiliary role in cultural relics protection, game development, architectural design, clinical medicine and other research.The key point of 3D reconstruction technology is how to obtain the depth information of the target scene or object. When the depth information of the scene is known, the 3D reconstruction of the scene can be realized only by registration and fusion of the point cloud data. Deep application research based on 3D reconstruction model can also be carried out immediately.