One mixed severe convection process which was accompanied by tornadoes, occurred in Huang-Huai Region (Yellow River and Huaihe River) and Jiang-Huai Region (Yangtze River and Huaihe River) from north to south on 19 September 2023. Funing strong tornado (corresponding to EF3) was the strongest tornado, which was 1.2 km away from Tongying Village where extremely strong wind of 41.8 m·s-1 (Scale 14) was observed. Based on the data from ground automatic weather stations and sounding stations, data from S-band dual-polarization radar, we analyze the Funing strong tornado in this paper. The results show that the tornado occurred in the strong warm and moist zone between the subtropical anticyclone and the low-level shear line. The slope of low-level front was large. The convergence line moved southward on the ground rapidly, combined with extremely low height of lifting condensation, low convective inhibition, high convective available potential energy and vertical wind shear. These conditions were favorable for the formation of tornadoes. The Funing strong tornado was a typical severe rainfall supercell tornado, characterized by hook echo, bounded weak echo region and deep strong meso-cyclone. The high, slanting, strong echo extended to the height over 16 km. Tornado debris signature (TDS) observed by dual-polarization radar was wide, indicating the tornado was strong and destructive. Affected by strong vertical wind shear, the differential reflectivity (ZDR) arcs separated from the strong specific differential phase (KDP) center in the hook echo, and the inclined vertical circulation was conducive to the maintenance and development of the storm. Heavy precipitation echo with low centroid appeared in the front of TDS. After rainfall and temperature cooling appeared on the ground, ZDR arcs and ZDR columns weakened and disappeared, and then the tornado weakened rapidly.