Abstract:The following are the main characteristics of the general circulation of atmosphere in July 2017. There were two polar vortex centers with stronger strength than normal in the Northern Hemisphere. The mid high latitude circulation showed a five wave pattern. The strength of subtropical high in the Northern Hemisphere was stronger than usual, the location of northwestern Pacific subtropical high was by north and the ridge line oscillated greatly. In July, the monthly mean temperature of China was 23.2℃, 1.3℃ higher than usual. The monthly mean precipitation of China was 112.5 mm, 6.7% less than usual, and especially in the west of Northeast China, northeast of Jiangnan, southwest of Jianghuai and north of Xinjiang; it rained much less. The heavy precipitation processes in July mainly occurred in Northeast China and Southern China, and there were nine regional torrential rain processes. What’s more, the rainstorm from 13 to 14 July broke the extreme values in historic records in many aspects. Eight typhoons were generated in the Northwest Pacific in July, of which seven were active and three landed in China. The number of typhoon is more than normal and is the maximum between with 1994, 1967 and 1971. In addition, drought hit the east of Inner Mongolia, and the regions of Jianghuai and Jianghan. Heat wave continued in central and eastern China as well as Xinjiang, lasting as long as 20 days. High temperature weather over 35℃ happened at 1884 stations and the extreme high temperature was found in Turpan, being 49℃.