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A new motion model and estimation algorithm is proposed to compute the general rigid motion objects 6-DOF motion parameters and center of rotation based on stereo vision. The objects 6-DOF motion model is designed from the rigid objects motion character under the two defined reference frames. According to the rigid objects motion model and motion dynamics knowledge, the corresponding motion algorithm to compute the 6-DOF motion parameters is worked out. By the rigid object pure rotation motion model and space sphere geometry knowledge, the center of rotation may be calculated after eliminating the translation motion out of the 6-DOF motion. The motion equations are educed based on the motion model and the closed-form solutions are figured out. To heighten the motion estimation algorithms robust, RANSAC algorithm is applied to delete the outliers. Simulation and real experiments are conducted and the experiment results are analyzed. The results prove the motion models correction and algorithms validity.