Empirical Orthogonal Function (EOF) analysis of 622 meteorological station data from 1970-2000 shows an increasing trend for vapor pressure deficit as well as increasing atmospheric thermodynamics in most regions of China due to climate warming. At the same time, wind speed decreases. Regions from middle part of Inner Mongolian to the north of middle reaches of Changjiang River is most sensitive for enhancing atmospheric thermodynamics, where “dry force” keeps up rise because of up going temperature,and potential evaporation is dropping slower than in other regions. The rise in temperature also has impact on low cloud cover from the middle part of Inner Mongolian to the north of middle reaches of Changjiang River, where low cloud cover is dropping fast. It is likely that climatic warming results in lifting condensation level of low cloudbase, and induces the change of low cloud cover.