Comparison of the Structural Characteristics of the the Jiulong Vortex Continuing to Move Northeast and Stagnating in the Sichuan Basin

With on-site observation data， NCEP reanalysed data and annual statistical results of the Southwest Low Vortex， we checked information of the Southwest Vortex activities in the past ten years， The moving of the Kowloon vortex from the vortex source area and moving to the northeast through Sichuan Basin is called the moving out type.The one with little stagnation in Sichuan basin after the Kowloon vortex moves out of the vortex source area is called stagnation type， classified the vortex sources and paths， and focused on comparative analysis of characteristics between moving-out type and stagnant type of Jiulong Vortex activities， such as circulation situation， heat change and power wave.The conclusion is as below， （1） at 200 hPa level， for moving-out type， main position of South Asian High Pressure is further south and the strength is weaker， the position of high altitude jet is further south and strength is stronger， mid-latitude area has low groove and low vortex is located in front of high altitude groove