In order to improve the anti-jamming ability of the UAV guidance system in complex electromagnetic environment， a precise guidance method based on laser is used in the landing phase of UAVs. In this paper， we analyze the principle and process of the laser relative guidance system. Further， we design the landing test process of UAVs based on the laser guidance. The flight test is carried out on a scaled UAV platform and the important test data are obtained. Finally， we convert the laser relative guidance data and the differential GPS guidance data into the ground-level coordinate system， and the data comparison and error analysis of the two systems are completed. We further sort out the problems that need to be considered when the laser relative guidance technology is applied in practice.