Using the statistical method and the numerical simulation method,the precipitation redistribution after weather modification and the possibility of the influence on local precipitation was discussed.Statistical results indicate that artificial rainfall influences the nature distribution of precipitation,and two pieces of influence area are appeared at downwind area of the operation base.One is a rain increasing area (at downwind 15—50km area of operation base), another is a rain reducing area(at downwind 90—150km area of operation base). Results of numerical simulation indicate that the artificial catalys influences the precipitation development procedure and transforms the precipitation distribution.It is possible to control precipitation and to weaken local precipitation through artificial conscious influence.