The long-term trend and oscillations of Lanzhou temperature over recent 64 years are detected by using the singular spectrum analysis. Results show that there is a general warming all over the period. The amplitude of interdecadal oscillations is large, with a cooling of 1℃ from 1946 to 1967 and a warming of about 1.3℃ from 1968 to the earlier mineties. There are also interannual and intermonthly oscillation periods of 7.5- year, 3.3-year, 7.69-month, 3.38-month. Since 1976 strong changes in seasonal cycle have taken place, with winters becoming warmer and summers colder. The annual range of monthly mean temperature in the latest 21 years was 1.7℃ less than in the earlier 43 years. The monthly mean temperature anomaly for 4 months extension may be predicted by using SSAMEM.