Abstract: Based on the fifth Generation Global Atmospheric Reanalysis Data (ERA5) released by the European Centre for Medium-Range Weather Forecasts (ECMWF) and the cloud water resources monitoring and evaluation method released by the Weather Modification Center of China Meteorological Administration, the total amount, spatial and temporal distribution and movement characteristics of cloud water resources in the karst area of western Guangxi from 2002 to 2021 were studied. The results show that the average annual total amount of water condensate in western Guangxi is about 22.5×10¹³ kg. The precipitation efficiency of water condensate is about 65.5%. The average annual total amount of cloud water resources is about 7.8×10¹³ kg. The horizontal distribution of cloud water in winter, spring and summer is mainly characterized by saddle field distribution of high in northeast and southwest, low in northwest and south. In autumn, it is mainly characterized by stepwise distribution of gradually decreasing from northwest to southeast. In terms of vertical distribution, warm cloud water is mainly distributed in the low level of 925 ~ 600 hPa in autumn, winter and spring, and cold cloud water is mainly distributed in the middle level of 600~400 hPa in summer. The cloud water in the middle layer mainly moves eastward, while the cloud water in the lower layer has two main moving directions, which are moving between northward and northeastward and moving between westward and southwestward. The horizontal transport flux of cloud water is larger in winter and spring, and smaller in summer and autumn.