Analysis on Annual Rainfall Series Representativeness and Years' Changes of Weihe River Upstream Region

It takes tianshui，gangu，shouyang，xindianzi and shendu five rainfall stations as representative stations，analyzes the series representativeness of annual rainfall of Tianshui Station from 1935-2014 and tianshui，gangu，shouyang，xindianzi and shendu from 1952-2014with the use of mathematical statistics.It also discusses many years' changing process of each representative station rainfall.