Abstract: A ccording to the weather pracfice,the location of main rain belt in China is dependent on combination of East Asian Blocking High(EABH) and long it udinal place of westterminal point of West Pacific Subtropical Ridge(WPSR) when EABH appears in July.Taking longit udinal place 120°E as the westter minal point of WPSR,Wpattern could be defined when it reaches west side of 120°E,otherwise Epattern could be defined.Principal rain belt was situated ar ound Yangtze River when Wpattern was est ablished,it leads to severe flood saround Yangtze River since 1951,and principal rain belt was situated in south side of Yangtze River when Epattern was established.Not only there are significant differences between Wand Epatterns about generalcir culation in July but also the two preperiodsignals are greatly different aboutsea,at mospheric circulation,weather and climate.