The pulse-dilation framing tube using the double magnetic lenses is designed and the performance of spatial resolution is simulated and measured. The spatial resolution of tube is measured through the 2# plate. The spatial resolution at the off-axis position is tested through a large cathode. The measurement results show that the spatial resolution of tube is 74 μm, and the 30 mm off-axis position on the cathode is resolved while the image is demagnified 1 times. The spatial resolution and the spatial resolving power at the off-axis position are better than the tube using the single magnetic lens. Therefore, the spatial resolving performance of pulse-dilation framing tube is improved by the double magnetic lenses.