In the treatment of amblyopia in children, grating rotation training (also known as CAM training) has been demonstrated to be an effective way of shortening treatment time. However the traditional CAM training based mechanical way is limited in the adjustment of rotating speed and spatial frequency. On the other hand, multimedia based CAM training is needed for hardware. Due to limited memory spuce, there needs to be a new way of achieving this function in a digital synoptophore. In this paper, the technology of multi-Thread programming is used to solve this problem under the use of VC ++6.0. It is prove that this software use few resources, has low cost, has good compatibility, and a smooth raotating grating in a digital synoptophore. It provides a convenient way of treating children with amblyopia.