An efficient high-quality soft shadow rendering method based on adaptive light source sampling is proposed.First, multiple shadow maps are generated by regular sampling of some areas of the surface light source, and then the shadow maps are re-projected to the viewpoint.The shadow difference value in image space is used to determine if it is necessary to further subdivide light source sampling points, so as to realize adaptive layer-by-layer sampling and avoid generating shadow maps that do not contribute to soft shadow quality.The proposed algorithm can not only keep the soft shadow realistic, but also improve the rendering efficiency.