Abstract: The characteristics of a tornado developed from outside of the super-typhoon "Mujigae" (No.1522),which happened in Panyu district of Guangzhou,were analyzed using the analysis data from the LAPS (Local Analysis and Prediction System) and Doppler radar data.The results show that this tornado is ranked as F2.It is located at the front-right-hand side along the moving direction of the typhoon with about 390 km.This position is a convergence zone of strong southerly and southeasterly flows,with sufficient unstable energy,a stronger vertical wind shear,and a cold air intruding from the low layer.There is an obvious bow structure rather than hook or drape characteristics on the radar reflectivity graph,and a moderate intensity meso-cyclone existing in the low-level on the radial velocity graph.It is hard to define it as a supercell or non-supercell tornado according to the above information.