The NCEP/NCAR reanalysis data have been used to study differences between the Somali jet and the cross-equatorial flow at 105°E in association with the Asian summer monsoon variations.The results demonstrate that there are significant differences in periodicities as well as the time of climatic jumps of the interannual and interdecadal variations between the two cross-equatorial flows.The strong negative correlations are found between the two cross-equatorial flows in some decades.The Somali jet is closely related to the subsystems including the Indian summer monsoon,East Asian subtropical summer monsoon and South China Sea summer monsoon in the Asian summer monsoon regimes.However,the cross-equatorial flow at 105°E is only closely related to the South China Sea summer monsoon variations.The two cross-equatorial flows are found to have different influences on the circulation changes related to different members of the Asian summer monsoon system.