Abstract:The technique features of Unmanned Aerial Vehicles(UAV) terahertz wave Synthetic Aperture Radar(SAR) imaging were analyzed．The relation among average power of radio transmitter，resolution in azimuth，maximum range migration, strip width and other parameters of SAR in typical frequency bands was discussed．For multiple scatter targets，based on the Range-Doppler algorithm，the imaging simulation was conducted to verify some operation characteristics of UAV THz SAR and obtain high resolution radar image(0.3 m×0.3 m)．