An analysis is made of the main causes, weather patterns, singlestation influencing factors and physical parameters of four severe convective weather events in 2004 in Zhengzhou by using routine meteorological data and 1°×1° reanalysis data of NCEP. The results show that it is favorable to the occurrence of severe convective weather that there is radiative warming at lower levels and coldadvection cooling at upper levels while under the control of northwest air flow or the North China low, in which convective energy increases quickly. The mesoscale convergence line appeared on the surface three hours ahead is the triggering mechanism of severe convection weather. The vertical distribution characteristics of singlestation 〖WTBX〗θ〖WTBZ〗se, atmospheric entropyremoving index, vertical wind shear, precipitable water, etc., can be used to judge the type of severe convection weather.