Abstract: In this paper,the effect is discussed of seeding on the variation of Ag⁺ content in the rain water,by analysing the Ag⁺ distribution in the rain water from the artificial precipitation experiment in Gutian,Fujian. The result shows that there is close relationship be tween seeding and the increase of Ag⁺ content in the rain water,and that spatial and temporal distributions of Ag⁺ content are consistent with the center of rain increase and rainfall center for the area.The study also indicates that the increase of Ag⁺ content may result from AgⅠ particles participation tn the rainfall process and falling with raindrops simultaneously as well as from the rain washing.