Abstract: The number of echo photons in deep space laser ranging is rare because of the long distance, so it is of great significance to study the method of increasing the number of echo photons to improve the success probability of ranging. In this paper, a tip/tilt mirror is added to the transmitting optical path of the laser ranging system of the 1.2 m Telescope of Yunnan Observatory, and the pointing position with a large number of echo photons is searched by quickly and accurately controlling the propagation direction of the laser beam. First, the tip/tilt mirror scanning system is designed, and then the system is simulated and analyzed to simulate the variation of the deflection angle and energy distribution of the outgoing beam with the deflection angle of the tip/tilt mirror and the search effect by using the tip/tilt mirror. Finally, the actual observation experiment is carried out on the ranging satellite. The actual measurement shows that the minimum resolution of the two-dimensional tip/tilt mirror used by the system is 0.2″. After beam expansion by the laser emission system, the minimum search step of 0.005″ can be realized, and the control frequency can reach more than 100 Hz. The actual observation results show that the method of using a tip/tilt mirror to improve the echo rate is effective, and the higher the target orbit height is, the more obvious the effect. Therefore, it can be applied to a deep space target laser ranging system.