There was a mixed strong convective process occurred in Huang-Huai Area and Jiang-Huai Area from north to south on 19 September 2023, which accompanied by tornadoes. Funing strong tornado (corresponding to EF3) was the strongest tornado. Tongying village was 1.2 km away from the Funing strong tornado, which observed extremely strong wind of 41.8 m·s-1(level 14). Based on the data from ground automatic stations and sounding stations, data from S-band dual-polarization radar, the Funing strong tornado was analyzed. Results showed that: (1) Tornado occurred in strong warm and moist zone, which between the subtropical anticyclone and the eastern section of the low-level shear line. The slope of low level frontal was large. The convergence line moved southward on the ground rapidly, combined with extremely low LCL and CIN, high CAPE and vertical wind shear, favorable for tornados. (2) The cold pool and high-pressure center appeared behind the thunderstorm would contribute to the development of vertical vorticity near the ground before tornado occurred. But the heavy precipitation adjacent to the front side of the thunderstorm generated cold pool and strong downdrafts, would block the movement and development of the tornado. (3) The Funing strong tornado was a typical heavy rainfall supercell tornado, characterized by hook echo, BWER and deep strong meso-cyclone. The strong echo was slope and extended to 16 km. (4) TDS observed by dual-polarization radar was wide and deep, indicated the tornado process was strong and destructive. Strong ZDR arcs appeared at the head of the hook echo and separated from the strong KDP zone, formed tilt vertical circulation, would promote the development and maintenance of the supercell. Heavy precipitation echo with low centroid appeared in the front of TDS, precipitation and cooling appeared on the ground, and ZDR arcs and ZDR columns weakened and disappeared, and then tornado storm weakened rapidly.