The Medieval Warm Period (MWP) is the most possible analogue type of the 20th century warm period during the past 2000 years. This paper applies rich Chinese historical documents to examine the Medieval Warming's impact on other natural elements,to promote our understanding on the features of the Medieval Warm Period,and to offer reference to the study on the possible natural variabilities and influences brought from the Warming Period in the 20th century. This research reconstructs the winter cold/warm index of Kaifeng area from 960A.D. to 1109 A.D., and transfers the index to winter temperature departure. The result indicates that the Medieval Warm Period displays a rapidly warming phase, especially after 1020A.D., the winter temperature increases 2. 2℃ within 40 years, the 10-year average temperature rises more than 0. 5℃. Analysis on the phonological phenomenon from historical literature at that time shows that the rice harvest time at Kaifeng area delays,which says that the winter postpones at that time. What's more, the distribution area of winter wheat, tea tree, orange and sugarcane expands northward. The north boundary of subtropical zone and the warm temperate zone both shift northward by one degree latitude. This research reconstructs the annual precipitation grade of North China between 907A.D. to 1126A.D.,to discuss the warming's effects on the pattern of precipitation. The annual precipitation grade sequence suggests that there is more precipitation in North China at that time,and the large precipitation event occurs frequently, the peak of the precipitation sequence is in good agreement with the inundation peak of the Yellow River. The increased precipitation in North China is the fundamental cause for the inundation of the Yellow River during that period as inferred from above. However, the climate in the agro-pastoral transitional zone is comparatively wet, the population increases, and the agriculture cultivation develops. The precipitation variety in North China and the agro-pastoral ecotone suggests that the Medieval Warming leads to the change of the precipitation pattern in Eastern China to a certain degree: the precipitation in North China increases, the agro-pastoral ecotone turns wet. In this way, the precipitation tendency of North China in the future is worthwhile concerned. Meanwhile, the water surface of Taihu Lake region rises and there are serious flood events occur. The Taihu Lake expands as well as new lake group appears. The water system of Taihu Lake basin changes: the rivers clog, the seawater intrudes, the seawalls are constructed and the Wusongjiang River alone, becomes the main channel for the Taihu Lake water to discharge into the sea. The formation of this water system pattern is probably because the drainage problems result from climate warming and the rise of sea level. Besides, the indentation of the coastline of North Jiangsu Province and the continuous retreat of the coastline of the Hangzhou Bay are both perhaps the result of the sea level rising at that time.