It is generally acknowledged that the law of climate change is the formation basis of Yun-qi theory, and it's more reasonable to study the scientific nature of the theory from the view of law of climate change. This paper chooses precipitation, average relative humidity, average wind speed and average temperature (30 years' meteorological data of Beijing station, Zhengzhou station, Hefei station and Guangzhou station) to represent those elements of Yun-qi theory, the meteorological factors include shitu, zaojin, fengmu, shuhuo and hanshui, and analyze every variation in a period according to five evolutive phases and six climatic factors. It shows that the corresponding meteorological factors have remarkable changes in those periods of shitu, zaojin, fengmu, shuhuo and hanshui, vividly describe the inner connection between the structure of Yun-qi theory and meteorological information. It probably shows that the ancients summarize the theory based on the long experience of dealing with the climate change.