Based on ERA5, NCEP/NCAR reanalysis data and several Sea Surface Temperature (SST) datasets from 1979 to 2019, the impacts of Indian Ocean Dipole (IOD) mode on the East Asian upper-level jet stream in summer were analyzed, and the thermal and dynamic mechanism were dis￣cussed. Results show that as the IOD is in the positive (negative) phase in summer, which indicates the western Indian ocean is warm (cold) and the eastern Indian ocean is cold (warm). Associated with the positive phase of summer IOD, the East Asian subtropical jet will strengthen in winter, and the polar front jet will weaken. The enhanced meridional temperature gradient, the enhanced the baroclinicity of the lower atmosphere and the strong synoptic-scale transient eddy kinetic energy provided benefit conditions for the enhancement of the East Asian subtropical jet, and vice versa for the weakened polar front jet. Multiple linear regression was used to quantitatively distinguish the relative contributions of thermal and dynamic factors. The dominant factor linking the summer IOD and winter East Asian jet streams is the thermal factor. Comparing the two dynamic factors, the atmospheric baroclinicity is the main factor for the weakened polar front jet, while synoptic-scale transient eddy kinetic energy is the main reason for the strengthened subtropical jet.