Abstract: Wavelet analysis was used in this paper to study the multi-time-scale structure of the temperature and precipitation series in Guangxi Zhuang Autonomous Region in the recent century, and the coupled characteristics between the sea surface temperature of Nino3 region and the two series mentioned above were diagnosed by using singular cross-spectrum analysis (SCSA). The results indicate that the ascending trend accompanied with the quasi-biennial oscillations dominated in the temperature variation while the precipitation showed a descending trend with the 32-year and quasi-biennial oscillations. Guangxi climate was characteristic of dry-cold from 1884 to the early 1910s, wet-cold from the early 1910s to around 1930, wet-warm from around 1930 to the late 1950s, and dry-warm from the late 1950s to the early 1990s. The 3-7-year oscillation component of ENSO exerted marked influence on Guangxi climate. The coupled variations of SST in the Nino3 region and Guangxi climate were reflected on the decadal scale for temperature and interannual scale for precipitation.

Key words: Guangxi, climate change in recent century, wavelet analysis, singular cross-spectrum analysis