16 cases of northeast cold vortex in China have been chosen,including 8 cases of storm rainfall (type A) and 8 cases of weak rainfall(type B). Their composite diagnoses of physical variables were also done. The results show: 1. In general, the storm rainfall events often take place in the developing stage of the cold vortex,and the weak rainfall occurs in its mature phase. 2. The type A maintains close links with the subtropical low-pressure systems,and this feature is not obvious in the type B. 3. The precipitation centers of the type A are situated in the southeast quadrant of the cold vortex. This rainfall area corresponds well with the high-value areas of low--level convergence, high-level divergence,and low level vorticity, moisture convergence and θse-frontogenesis.