The mesoscale features, triggering conditions and radar echoes of strong convective weather processes occurred in Shandong from 13 to 14 June 2016 are analyzed by using the NCEP reanalysis data, conventional observation data, regional automatic station data and Doppler weather radar data. Results show that the upper trough in front of cold vortex and ground cyclones cause the convective weather on 13 June. The upper cold vortex and ground cyclones lead to the convective weather on 14 June. High-level dry cold air and low-level warm air flow are conducive to the increase of convection instability. The convection system(MαCS) is composed of two MαCSs on 13 June and the convection system(MαCS) is evolved from MβCS on 14 June. The convergence line and dry line are the trigger conditions of strong convective weathers, and the strong development of convective cells can be induced where they overlap. The right deflection of high-level wind moving path, the invasion in of upper northwest wind and the topographic factor are the reason of the development and persistent existence of supercell thunderstorms. The precipitation area has a good corresponding to the area with CAPE(convective available potential energy) of 400-1 200 J·kg-1 before 6 h. The water vapor is dominated by the southwest input and the north-south convergence during the strong convective weather processes on 13 and 14 June. Besides, the moisture transport from Bohai Bay is also important for the weather process on 14 June. The wider MPV anomaly at the upper level and its significant downward transmission, and the increase of positive and negative vorticity difference at high and low levels can cause stronger ascending motion and convective instability.