Basing on the daily precipitation data at 90 stations in Guangxi and the NCEP/NCAR reanalysis data during 1961-2010, the characteristic of the atmospheric circulation anomalies of the heavy rains in Guangxi in the past 50 years were analyzed by using Lorenz circulation decomposition method. The deviation index H^*, I_c and I_us for global (local) stationary waves are used to analyze the stationary wave anomalies in the extensive heavy rains. The results show that: In recent years, the occurrence of the extensive heavy rain processes exhibit an increasing tendency. The extensive heavy rainfall processes caused by the different weather systems with the different location and intensity of the subtropical high. There is an obvious positive correlation between the extensive heavy rain processes and the intensity of the subtropical high and the H^* of the region(130°E-140°W，70°N-90°N)over Arctic Ocean, the negative correlation with the H^* of the Northern Greenland and the Midwest Equatorial Indian Ocean and the Northeast Kazakhstan. The strengthen of I_c of the latitudinal bands (75°N-85°N) and (20°N-30°N), I_us of the latitudinal bands (10°N-30°N) and (35°N-55°N). The weaken of I_c of the latitudinal band (40°N-70°N). All these may be the causes of the increasing of the extensive heavy rainfall processes. There always is a most high value zone of I_us near the Arctic in the extensive heavy rainfall processes in Guangxi.