利用1961-2010年广西90个气象观测站的逐日降水资料和NCEP/NCAR再分析资料，运用Lorenz环流分解方法分析了近50年广西大范围暴雨的大气环流异常特征。结果表明，近年来广西发生大范围暴雨过程和平均暴雨日数均呈增多趋势。不同天气系统造成广西大范围暴雨的环流形势主要表现在副热带高压所处位置和强度的不同。从长时间统计来看，广西大范围暴雨与副热带高压的强度、北冰洋（130°E-140°W，70°N-90°N）区域的纬偏成正相关关系，与格陵兰岛北部、赤道印度洋中西部和哈萨克斯坦东北部的纬偏值成反相关关系。北半球高纬度地区（75°N-85°N）和低纬度地区（20°N-30°N）定常波强度增强，中纬度地区（40°N-70°N）定常波强度减弱，低纬度10°N-30°N和中纬度35°N-55°N定常波不平稳度增强，可能是造成广西大范围暴雨日数增多的原因之一。在广西大范围暴雨过程中，北极附近区域为定常波最不平稳的地区。

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.