Strong background noise can considerably reduce the probability of ranging success in lunar laser ranging and space target daytime laser ranging. The 1.2 m telescope laser ranging system of Yunnan Observatories uses an adjustable field diaphragm in the receiving light path to reduce the background noise by changing its aperture size. However, because of velocity aberrations, when the receiving field of view is reduced to a few arcseconds, the echo is blocked by the aperture and the detector does not receive the echo photon. To address this problem, a method of adding a two-dimensional tip/tilt mirror in front of the field diaphragm is proposed. The tip/tilt mirror can allow the deviated echo to be received by the detector through the aperture center. The deviating angles of the echo are measured by observing some high-orbit satellites and geostationary satellites. Additionally, the effect of using the tip/tilt mirror to correct the deviation angles is simulated and analyzed. The results show that this method can quickly and accurately correct the deviating angles of the echo in laser ranging with a small field of view and can provide support for lunar laser ranging at full moon and space target daytime laser ranging.