Using the observational data， intensive surface observation data, TBB data and NCEP reanalysis data, the synoptic and dynamic diagnosis and mesoscale characteristics of a continued strong convection weather process are analyzed. The results show that: (1) the Continuous downslide cold troughs, from Mongolia cold vortex, are its impact systems. High cold trough, lowlevel warm temperature ridge, and wet tongue overlapping are conducive to the establishment and development of convective instability. (2) The warm dry lid formed by the inversion layer near 850 hPa at the lower troposphere is more conducive to the occurrence of deep convective activity. The larger the air temperature lapse rate is, the easier the occurrence of thunderstorm and gale is. And there is a good correspondence between magnitude of the CAPE, vertical wind shear and the strength of convection weather. (3) The strong convection weather process in 23-24 June 2006 is caused by mesoβ scale hailstorm cloud with a 6 h life time, but the violent weather in the 25th is caused by mesoα scale squall line cloud with a 10 h life time. (4) The surface convergence line or dry line is one of the factors which trigger the strong convection; and the convective cells or cloud cluster are generally generated close to the surface convergence line.