The spatial resolution of the time dilation X-ray framing camera is simulated by using the Monte Carlo method, the finite element method and the finite difference method. While DC bias on the photo-cathode is -3 kV and three large aperture magnetic lens are used to image the electrons from the photo-cathode onto the microchannel plate with the image ratio of 21, the theoretical static spatial resolution is better than 110 μm. The relationship between the spatial resolution and the point of electron emitted from the photo-cathode is obtained. While the distance of the electron emitting point to the center of the photo-cathode is increased, the spatial resolution is worse. The variation of the spatial resolution with the photo-cathode voltage is provided. The spatial resolution is improved with increasing photo-cathode voltage. In addition, the spatial resolution is better by increasing the numbers of the magnetic lens. Furthermore, it can be seen from the simulation results that the image plane is a curved surface while the photo-cathode is a plane.