Abstract: In order to identify the optical characteristics of cirrus clouds, a typical cirrus event in Wuhan in November 2023 was selected as an example for analysis based on the continuous observation data of the three-wavelength raman-mie scattering lidar in Wuhan National Basic Meteorological Station from October to December 2023. The results are as follows. The average cloud base height of cirrus during this event was 7.0 km, and it showed a trend of slowly decreasing at night and gradually increasing during the day. During this period, the average lidar ratios of 355 nm and 532 nm were 40.6 Sr and 59.3 Sr, respectively. The phases of cirrus particles were identified by combining the backscattering coefficient and depolarization ratio. During the event, the differences in backscattering coefficients between the three wavelengths of the cloud base and the cloud top were small, and the depolarization ratios were above 0.35, which meant that cirrus particles were mainly non-spherical large particles. The backscattering coefficients of 355 nm and 532 nm in the cloud were significantly higher than 1 064 nm, and the smaller depolarization ratios indicated that there were more spherical particles in the cloud. So the structure distribution characteristic of the cirrus was ice crystal-supercooled water-ice crystal from the bottom up.