In this paper,a tornado case,which occurred in Wuwei,Anhui Province in Jul. 8 2003,is analyzed by using the WSR-98D Doppler Radar data and the Lightning Location data.The tornado took place on the left-hand side of a low-level jet,and the large scale background environment dynamically and thermally are favorable to the genese of tornado.From the analysis of the Doppler radar echoes,we found that the tornado was born in a mesoscale(γ-scale) cyclone,which developed from the middle level to low level.The analysis of the lightning location data shows that about 10 minutes before the tornado took place,the lightning rate increased distinctly,and after the occurance of the tornado it fell down and the negative ground flashes were obviously increased.Furthermore,tornado lightning existed in the most lifetime of the thunderstorm.In this paper,some observation facts of the tornado are different from some classical theories.Firstly,radar reflectivity factor is not as strong as the classical result.Secondly,the height of the radar echo of the tornadic thunderstorm is only about 6-9km as high as the common thunderstorm.Thirdly,in the tornado case,the negative ground flashes are more than the positive ground flashes,which is different from the classical theory that the fraction of tornadic storm is dominated by frequent positive ground flashes.