Using CINRAD data, sounding data , automatic meteorological station data and disaster investigation reports, the environmental physical variations, storm evolution , low-level small-scale vortex and dual polarization characteristics of outbreak tornadoes in Shandong on 5 July 2024 are analyzed. The results show that all nine tornadoes generated to the east or northeast of the ground low-pressure center, with significantly strengthened low-level jet streams and increased vertical wind shear at low altitudes, which are key environmental factors for tornado outbreak during an extratropical cyclone. Supercells within quasi-line convective systems or newly developed supercell storms in the warm zone in front of QLCS are efficient in producing tornadoes. The rapid decrease of the strong vortex center or the rapid increase of part radial velocity in the low level are precursors to the generation of small-scale tornado vortices.The maximum radial velocity difference above 1km in the low level of the storm is significantly greater than that below 1km. The intensity of vortices above 1km in the low level of the storm is more indicative for early warning of tornadoes. Dongming tornado is the most damaging and lethal tornado, the parent storm has the strongest updrafts. The width of low-level tornadic debris signature (TDS) is about 2km, and the top of TDS reaches about 9km, showing a dispersed state with a maximum width of about 4km.