In this study, two Tornado disasters occurred in northern Jiangsu, Chinafrom 2009 to 2016 were studiedvia numerical simulation.The objective of the study was to explore the reasons of the northern Jiangsu coastal plain area as the most frequent place of strong tornados in China in spring and summer.The mechanism of tornado formation due to emergence of double front systems in the area was discussed.The results showed that the tornado events in northern Jiangsu accounted for 58.6% of that of the whole province.Particularly, Yancheng and Xuzhou are two cities with high incidence of tornadoes.In spring and summer, the intensities of cold, warm, dry, and wet air masses are similarin the area, forming many mesoscale front systems.Thus, the area is prone to local strong convection tornadoscaused by the convergence of two frontsystems.Analysis of two typical strong convection tornado sites in Yancheng (2016) and Xuzhou (2009) showed that the Yancheng tornado was due to the convergence of a cyclone front and a shore front, while the Xuzhou tornado was a result of a deformation field frontogenesis and a sea-breeze front.The WRF simulation results showed that the convergence of the two frontal systems and the encounter of the frontal secondary circulation caused vertical torsion of the local horizontal wind and horizontal shear of the vertical wind, which increased the regional positive vorticity.The superposition of the vertical ascending branches of the double front secondary circulation produced strong systematic uplift in flat areas, resulting in an area favorable for the development of tornados.Moreover, all of the common strong convection indices showed strong local characteristics, which need to be used for reference according to local statistical characteristics.