Abstract: In this paper, the interannual variability of the South Asian High (SAH) core position in early summer and its relationship with the anomalous diabatic heating over Southeastern Tibetan Plateau (SETP) were analyzed using European Centre for Medium Range Weather Forecasts (ERA-interim) reanalysis data and methods of statistical and dynamic diagnoses. The results showed that the SAH core position in early summer significantly varies on the quasi-six-year band. Only the interannual variability of its meridional position significantly correlates negatively with the activities of latent heating over the SETP. Associated with the stronger latent heating over the SETP in early spring, the westerly anomalies appear around the south flank of the Tibet Plateau near 20°N. The positive vorticity anomalies on the north side and the negative vorticity anomalies on south side of the westerly anomalies strengthen the anomalous cyclones near the Tibet Plateau and the anomalous anticyclones over the Indian Subcontinent Peninsular as well as the Indian Ocean. This configuration of the anomalous atmospheric circulations, lasting from early spring to early summer, is not beneficial to the northward movement of the SAH, and finally further causes the SAH´s core position to be farther southward than normal. Associated with the weaker latent heating, the opposite phenomena occur, resulting in the SAH’s core position being farther northward than normal. Therefore, it can be said that the early spring latent heating over the SETP is a key predictor for the interannual variability of the meridional SAH’s core position in early summer.