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In this paper, a new rapid 3D human modeling and animation method based on sketch and motion database is proposed. This method reconstruct 3D human ball B-Spline model from sketch and implement real-time animation using motion database. We firstly blend all parts of sketch to obtain a new sketch which can represent human by one stroke. Then we triangulate this new sketch and select some circum circle centers of the triangles as key points. Radius information can be evaluated by the circum circle radius of relative triangles. Combine key points and radius information, ball B-Spline character model can be obtained through interpolation method. According to human body topology and skeleton structure described by BVH file in motion database, we can define all animation joint positions. Finally, we implement real time animation using motion data from database by updating control points and control radius of ball B-Spline model.