Rain flower pebble is one of the symbols of Nanjing. It was praised as "lucky stone" by the 24th Olympic Games.Started from 1999,Yuhuatai Scenic Area holds this festival every September. In addition to fascinatingopening ceremony, there also holds an exhibition ofexquisite rain flower pebbles, design and handicraft contest, seminar and pickingpebbles, etc.. The producing place, Liuhe County, holds branch activities at the same time.