Based on the moving target division algorithm and the principle of simple calculation, great speed, and precise withdrawal of the moving target, the authors proposed an automatic division algorithm of moving target based on characteristics object, which combines the algorithm with correctional snake model to precisely withdraw the external outline of the moving target. Analysis and experiments have shown that the algorithm is simple and fast, few parameters need to be adjusted, and the capacity to resist disturbance is strong. The multiframe moving object mask can be effectively eliminated. Without overlapping multiple moving objects, the external outline of each moving object can be precisely located.