Based on the improved objective identification method of extratropical cyclones,this paper investigated the development rate and movement characteristics of extratropical cyclones at different scales in the Changjiang-Huaihe River Valley (CHRV) from April to June during 1986-2015.Results show that the overall cyclone development rate shows an upward trend first and then a downward trend,the larger spatial scale cyclone development rate shows a significant upward trend,and the middle scale cyclone development rate has no obvious change trend.The larger scale cyclone sources are concentrated at the junction of Hubei Province and Hunan Province.The middle scale cyclone sources are located in the eastern part of CHRV,such as Anhui Province.The sources of cyclones at different scales are located in the large value region of the non-adiabatic heating term in the whole atmosphere.During the initial stage of cyclone,there is a wind shear line in the CHRV.The wind speed in the northern CHRV is smaller than that in the southern CHRV.The geopotential height anomaly is negative in the lower troposphere and positive in the middle and upper troposphere over the CHRV,which belongs to a shallow low pressure system.All scale cyclones have east-moving and northeast-moving paths,but the larger scale cyclones have a larger proportion of northeast-moving path.