Climate Characteristic Analysis to the Mass Precipitation and the Period of Mass Precipitation in Zhaozhou County

in this article,the precipitation and the period of precipitation were analysed in recent 50 years in Zhaozhou county,the result showed that the mass precipitation was descending,and the period of mass precipitation was advancing tendency,and the mass precipitation and the period of mass precipitation showed the 11 years and 14 year's periodicity respectively.The annually precipitation in Zhaozhou expressed descending tendency,and also,between the mass precipitation 、the period mass precipitation and the annual precipitation expressed the positive interrelation,the more the annual precipitation,the more the mass precipitation!