旱灾与地气环流有很好的相关,根据对近50多年旱灾成因的普查,可将形成旱灾的地气环流形势分成4类:(1)大地冷涡;(2)月(季)际地温的大片负变温区;(3)大震前的大旱(旱震关系);(4)强震地热涡出现之后的地冷涡区.研究发现,大地冷涡因其波长较长,故移动缓慢,造成的干旱一般均较严重.T′32的月际负变温区一般是表示该地区地下热活动减弱,故可预测下月将少雨;T′32的季际负变温区,同理也可预测下季将少雨.强地震对正常地热活动是一个强干扰,我国的大旱大涝几乎均与强地震有关.“,”A good correlation exists between drought and underground general circulation. Based on about the data of drought of recent 50 years,there are 4 types in total of who create drought. The first is large underground cold vortex,the second is large negative area anomaly of inter-monthly (inter-seasonal) underground temperature of 3.2 m depths. The third is serious drought before strong earthquakes (drought-earthquake relationships). The last one is region that cold vortex stayed after a macroseism. Further more,we found that cold vortexes slowly move because of its long wavelength,and droughts result from cold vortexes are usually more serious. Negative anomaly of underground temperature of 3.2 m depths shows a weakened thermal process,it can be seen a signal to predict rainless the next month. After all,both serious droughts and floods of China are related to strong earthquake.