The characteristics of the southwest vortexes are analyzed under the condition of the presence or absence of typhoons by using the 700 hPa and 850 hPa synoptic maps at 08:00 and 20:00 (Beijing time, the same after)provided by the China Meteorological Administration (CMA) and the daily four times ERA-INTERIM reanalysis data with 0.75°×0.75°spatial resolution provided by the European Centre for Medium-Range Weather Forecasts (The European Centre for Medium-Range Weather Forecasts). The generated numbers, moving paths, life periods and precipitating impacts are analyzed based on the 149 southwest vortexes that generated from June to August between 2010 and 2017, and the characteristics of the southwest vortexes with the presence or absence of typhoons are also analyzed. The results show that the annual variation of the southwest vortex generating frequency with the presence or absence of typhoons is small, but the year with greater generating frequency difference like 2017 exists. Generally, the southwest vortexes mainly occurred in June and the vortexes impacted by typhoons are mostly generated in August. According to the characteristics of the moving paths, the southwest vortexes can be categorized into the local type and the moving types, and the moving types are further classified into the eastward moving type, the northeastward moving type and the southeastward moving type. Among them, the eastward moving type counts the most while the southeastward moving type occurs the least. The differences of the annual variation among the three moving southwest vortex types are small under the condition of the existence of typhoon and the intensity difference is less than that under the condition of the absence of typhoons. The local southwest vortex type is very different in annual variation under the condition of the presence or absence of typhoon, and the monthly variations of the four vortex types are various whether typhoons exist or not. The numbers of the southwest vortexes with different life periods decreased with longer maintaining time. The southwest vortexes always produce plenty of rainfall and the intensities of the precipitation produced by the moving southwest vortexes are greater when typhoons exist.
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