Combining statistic analysis with typical case analysis method, by use of the NCEP/NCAR grid reanalysis data (25°×25°), and routine observation data such as temperature, dewpoint temperature, visibility, pressure in Nanning, and radiosonde data in Hechi and Beihai, the circulation pattern and meteorological element features of several typical “HighHumidity weather” in Guangxi from 2005 to 2013 are analyzed. The results show that: (1) “HighHumidity weather” events of different degree are influenced by the stronger cold air before it; (2) “HighHumidity weather” occurs when the dewpoint temperature at 14:00 is higher than the lowest temperature of that day and the temperature, and humidity increase suddenly, with the development of warm low or inverted trough and no obvious southward cold air in midhigh latitude，as well as the strong south wind prevails at 850 hPa and 925 hPa, and the front inversion layer is on the ground; (3) “HighHumidity weather” usually disappears in two ways: cold ending and warm ending; (4) if Guangxi is affected by longer cold air in the winter and spring, and the temperature and humidity suddenly increases at 850 hPa and 925 hPa, and the dewpoint temperature at 14:00 is higher than the lowest temperature of that day in the further one or two days, “HighHumidity weather” can be forecasted.