7 wells whose underground water tables were affected by nature factors were monitored with an objective to find different impacts by different rainfall types in Yujiang Country, Jiangxi Province, China. Three rainfall types were found out accounting to changes of underground water tables and rainfall during 2 monitored years. They were Type Ⅰ(lasted long period with stretching rain), Type Ⅱ(lasted short period with drencher) and Type Ⅲ (no rainfall of prophase period then had moderate rain). The underground water tables were changed greatly by a middle rainfall in Type Ⅰ, so did drencher in Type Ⅱ. An occasional drencher or storm leaked into soil, couldn’t arrive at underground water table, so it had a little bit effect of water table in Type Ⅲ.