Aiming at the problems of precision and time-effect of virtual fitting human body model at present

an efficient and realistic virtual fitting algorithm for volume model based on voxel octree is proposed. Space are divided into several voxels

voxel intersects with body surface form body surface model

and voxel uses octree structure to store. Calculate the symbolic distance function（ SDF） of voxels in octree by depth images collected by Kinect. Marching cube is used to fuse the color texture of the image and render the realistic 3D human model. A collision detection response algorithm is proposed. The experimental results show that the method enhances realistic sense of human model

and the octree structure can effectively shorten the time of collision detection

which is of great practical value.