Using OLR and wind reanalysis data from NCEP and precipitation data from APHRO_MA_V1003R1 in Japan, the responding Low Frequency (LF) convection and circulation fields and precipitation anomaly features in ISO active years in main rainy season of Yunnan, and the impact of Intra-Seasonal Oscillation (ISO) in monsoon systems of Bay of Bengal (BOB) and South China Sea (SCS) which excited by tropical Indian Madden and Julian Oscillation(MJO) on Yunnan ISO during main rainy season have been analyzed. The results show that, in ISO active years in main rainy season of Yunnan, LF convection and circulation fields shows negative feature in phase 1~3 and phase 4~6 of Yunnan ISO wave, which caused by eastward and northward propagations of tropical Indian LF convection and westward propagation of subtropical western Pacific LF convection. In developing process of tropical Indian LF, on the one hand, it propagates along western bank of BOB in southwest-northeast directions, which excites Southwest Monsoon ISO of BOB active and to propagate to Yunnan; on the another hand, it propagates eastward from southern BOB to SCS and excites South China Sea Summer Monsoon（SCSSM）ISO active and to propagate northward to sub-tropical eastern China, where ISO turns to propagate westward to Yunnan. When it passes Yunnan and meets LF convection which propagates northeastward along western bank of BOB, a circle of relay propagation along zonal and meridional directions is accomplished. Besides, the precipitation in Yunnan shows positive abnormal in phase 1~3 (in phase 2 it is the most) caused by sub-tropical LF convection propagating westward to Yunnan and BOB LF convection propagating northeastward to Yunnan; and in phase 4~6 the precipitation shows negative abnormal (in phase 5 it is the least) caused by sub-tropical LF convection inhibiting region propagating westward to Yunnan and BOB LF convection inhibiting region propagating northeastward to Yunnan, so precipitation in main rainy season of Yunnan contains smarted response to LF convection. When tropical Indian MJO is strong, its propagation along 2 paths to Yunnan is also strengthens, which causes ISO activities in main rainy season of Yunnan stronger and to produce 3 time of active periods of LF convection. This kind of tropical Indian MJO propagation to Yunnan needs about 30~40 days. Therefore, that's the excitation of tropical Indian MJO to ISO of southwest monsoon of BOB and SCSSM, causes the two Asian monsoon systems of Eastern Asian Summer Monsoon (EASM) and Southern Asian Summer Monsoon (SASM) to impact on Yunnan ISO and precipitation during main rainy season together.
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