Based on the ana1ysis of the long-range variation of the Northern Hemisphere mean temperature(NHMT), the effect of the NHMT variation on the climate in China is discussed. It is shown that there is a significant positive correlation between the temperature anomalies in China and the NHMT, and the temperature anomaly in the middle and lower reaches of the Changjiang River and the North China Plain is about 1.4-1.6 times in magnitude as large as the NHMT anomaly. It is also shown that the precipitation anomaly in China is correlated with the NHMT,The significant difference of the 500hPa atmospheric circulation over Eurasia between the warm and cold years in the Northern Hemisphere shows that the statistical correlation between the climate in China and the NHMT can be interpreted by some physical processes.