The scanning mirror is an important component of hyperspectral imaging LiDAR. Three scanning modes of polyhedral rotating mirror scanning, vibrator mirror scanning, and conical scanning are analyzed in this paper. Traces of different scanning modes are deduced, and the relationship between laser scanning traces and scanning modes is obtained by combining aircraft tracks. On this basis, a conical scanning mode for hyperspectral imaging LiDAR system is designed. Experimental results show that when the flight altitude is 500 m, the repetition frequency of the laser pulse is 130 kHz and the divergence angle of the laser pulse is 0.3 mrad. The method meets the requirements of the field angle of 30° and the angle between two adjacent pulses is less than 1 mrad. Compared with other scanning methods, conical scanning can improve the density of LiDAR spot footpoints, which provides help for effective data collection and accurate classification of ground objects.