Based on the precipitation and mean temperature series in Changde City from 1968 to 2012, one -dimensional linear regression, Nonuple -Quadratic -Smooth filters, Mann -Kendall test, Yamamoto method and Morlet wavelet analysis were used to analyze the trend, abrupt change, periodicity of precipitation and temperature series, and then Hurst index were calculated using R/S analysis method to do some prediction of the change trend. The results show that the annual precipitation have a slightly increasing trend, no abrupt change was found in this series; it has 3 periods of 6, 15 and 28 years, and the precipitation will increase in the future; while the annual mean temperature appeared significantly rising trend at the 0.01 significance level, the abrupt change happened in 1994; temperature series have a primary period of 28 years，and the temperature will rise in the future.