This paper focuses on the relationship between initial 234U/238U in stalagmites and paleoclimate reconstructions based on 272 precise ICPMS 230Th data collected from nine big stalagmites in the Dongge Cave ( 108°5′E, 25°17′N ), Yamen Cave ( 107°54′E, 25°29′N ) and Lianhua Cave (109°32′E, 29°08′N) in southwestern China. The initial 234U/238U ratios in stalagmites have a parallel relation to δ18O records of SPECMAP and keep a negative relation to summer insolation for 25°N in long term records. The (234U/238U)0 in stalagmites fluctuated slowly during interglacial periods and intensively in glacial periods; during transitional stage between glacial and interglacial, the (234U/238U)0〖KG1〗in stalagmites shifted sharply. The (234U/238U)0 in stalagmites records BA warm events and YD chill events from the Last Glacial to Holocene, which is consistent with the long term (234U/238U)0 records, with heavier ratioes of stalagmites during chilling events and lighter ratioes of stalagmites during warm events. Initial 234U/238U ratios of stalagmites formed in a closed cave system are similar to δ18O values of the cave stalagmites from the same area, in contrast, the both in the southwestern regions of China display weak negative relationship with summer monsoon changes. (234U/238U)0 in stalagmites may be used as a useful proxy for longterm records of paleoprecipitation.