Abstract: The cause for the changes of China’s temperature fields during the recent 100 years (1881~1992) is diagnosed by using CCA method. The results show that (1) the enhanced greenhouse effect due to the increase of CO2 is more closely correlated with the linear trend of warming in China’s temperature fields and the relationship appears more obviously since 1980s; (2) the sensitive regions of greenhouse effect are located in the northern North China, Northeast China, western Northwest China and the mid-lower reaches of Changjiang River, respectively; (3) the effect caused by volcanism is of relative importance in the fluctuation superposing the long trend, and the sensitive region lies to the south of 35oN, the center is in southwestern China, (4) the warming from 1920s to 1940s seems to be the joint results of the greenhouse effect, volcanism and solar activity, and that by the end of 1970s may be mainly caused by enhanced greenhouse effect.