The 10^th session of IAMAS (International Association of Meteorology and Atmospheric Sciences) Meeting is held in Montreal, Canada from July 20^th to 31^st, 2009. The meeting is held by the circle of international atmospheric science every four years to mainly discuss the IPCC Fourth Assessment Report, climatic change, Asian monsoon and global climate, land-atmosphere interaction, atmospheric radiation, cloud and precipitation processes, synoptic system, climate model/polar climate, atmospheric chemistry, and other frontier and hot topics in the research of international atmospheric science. Dr. Yang Jing from the ESPRE Lab of BNU attends this meeting and gives a speech with the subject of Biweekly and 21-30 Day Variation of Subtropical East Asian Monsoon over the Lower Reach of Yangtze River Basin. In Dr. Yang’s research work, two key modes of season variability of summer precipitation in the lower and middle reach of Yangtze River are discovered by utilizing longtime observation data, and the research first depicts both commonness and difference between the generation and evolution of the two modes. The research findings have significant meanings to the understanding and predication of variation of subtropical East Asian Monsoon.