The characteristics of the Western Pacific Subtropical High (WPSH) and the Blocking High (BH) in June 2004 as well as the differences of 500hPa height and OLR between the drought years and the flooding years are studied. The results show that the important reasons for the below normal precipitation in June 2004 in Jiangxi are that the position of the WPSH is eastward and northward, and Okhotsk BH is weaker. The pattern of “- + -” of 500hPa height anomaly along the East Asian coast leads to the below normal precipitation in Jiangxi. The correlation analysis shows that the strong ITCZ leads to the northern WPSH and the below normal precipitation in Jiangxi.