Abstract:In this paper, both CMA and NCEP data are used to analyze the extremely severe rainfall in North China and Beijing which occurred during 19-21 July 2016 and brought the serious damage to people and society. The results are as follows. (1) At the end of the second ten days of July, the subtropical high moved eastwards and then maintained. The short wave trough was stopped and was almost stationary which was very favorable to the occurrence of the severe rainfall. (2) The coupling between the short wave trough in upper troposphere and the warm inverse trough at the surface caused rapid cyclogenesis. (3) The warm conveyor belt as the moisture passage transported very rich water vapor to North China and the obvious interaction between middle and lower latitude systems existed. (4) There were obvious multi scale characteristics in the 20 July 2016 heavy rain and the 21 July 2012 rainstorm, but they are different. The large scale forcing of the former was slight stronger, whereas the convection of the latter was more active. The mechanism and mesoscale systems of the rainstorm in 20 July 2016 need to be investigated in future.