Linear CCD dynamic scanning assembly actuated by a cam was proposed to extend the coverage of the remote sensing instruments, and the non-equilibrium load feature of the system and related multi-model control arithmetic were analyzed in detail. After discussing the strongpoint and shortcoming of existing methods, the dynamic scanning assembly actuated by a cam was introduced. In this method, a motor and a cam were used as the acting devices. The motor rotated at a constant speed and the linear CCDs were driven by the cam to reciprocate on the focal plane. The non-equilibrium load feature of the system was introduced by the special structure of the cam, platform attitude angles and the camera azimuth. As the non-equilibrium load feature could effect the CCD image, it was analyzed in theory. Analysis results show that the platform pitch angle affects slightly the non-equilibrium load feature, so it could be ignored. When the sums of platform roll angle and camera azimuth are not zero, the load torque shows different features in the lift section and return section of the cam. In consideration of that the cam speed was different in the lift section and return section of the cam when the same controller was used, one multi-model controlling method with varying input signals was imported. The relative experiments were performed and the results show that the difference between camspeeds in the lift section and return section can be eliminated effectively by the multi-model controlling method with varying inputs. The rotate speed precision of the cam is 0.48% in the uniform section of the follower. It concludes that this method is simple and convenient to be realized.