By using the CloudSat satellite data and the WRF mesoscale model, combined with NCEP reanalysis data and FY2G stationary meteorological satellite data, a deep convective weather process occurred in the Huanghuai area was studied. The weather characteristics, dynamic structure, temporal and spatial evolution characteristics of hydrometeors in the severe convective weather process were analyzed emphatically. Results show that:(1)The downstream of Huanghuai river located in the northwest edge of western Pacific subtropical high, which had high temperature, high humidity and good condition of convection potential. The ground cold front and low-level shear line lifted the air flow, and made it continue convergence rising, and the configuration of high-level cold and low-level warm and humid air provided a thermal instability for the development of strong convection. (2)The stationary satellites TBB product could locate and track deep convection system, but a single TBB products could not distinguish between deep convective clouds and thick high clouds, so this paper combined CloudSat satellite data and TBB products and classified clouds to three classification as Non-Convective Cloud (NDC), general Deep Convective Cloud (DC)and Deep Convective Core (DCC). (3)The DCC was located at the southern edge of the convective system. The particle size of the ice particles was larger, the ice number concentration was more, the ice water content was larger in the DCC, and the maximum area is near 12 km. This area may be the key occurrence area of the formation of large ice particles. (4)The WRF model showed a favorable effect for this process and showed the distribution characteristics of hydrometeors. An accumulation of supercooled water and hail cycle growth characteristics in the cloud was found. Snow crystals generated through collision and coalescence of ice crystals, which were generated by nucleation of ice nucleus,and graupel generated by the snow crystal aggregated freeze droplets and with supercooled rain drops freezing. Then, graupel transformed into hail by cycle of growth, and hail would shoot when hail increased to large enough. The snow crystals and accumulation of supercooled water is critical to the generation and growth of the grape and hail.