Abstract: Based on the monthly precipitation data from the Global Precipitation Climatology Centre (GPCC) and the reanalysis data from ERA-5 from 1979 to 2020, the correlations of the intensity indexes of the East Asian Summer Monsoon (EASM), the South Asian Summer Monsoon (SASM) and the Plateau Summer Monsoon (PSM) with the summer precipitation on the Tibetan Plateau (Plateau)are compared and analyzed. The synergistic configuration of summer monsoon system intensity was divided into eight types, and the influence of the multiple summer monsoon synergy on the summer precipitation over the Plateau was explored by synthetic analysis. The results show that the EASM index is negatively correlated with summer precipitation on the Plateau, while the SASM index and the PSM index are positively correlated with summer precipitation on the Plateau. In summer, the precipitation in the eastern part of the Plateau is more closely linked to the EASM, while precipitation in the central and western parts of the Plateau is more closely linked to the SASM, and the PSM is well correlated with the overall precipitation in the Plateau. Among the multiple monsoon synergy, the strength of the PSM is the main influence on the amount of summer precipitation in the Plateau region, while the synergy between the PSM and the SASM is more closely associated with the summer precipitation anomaly in the Plateau. In the years of strong EASM-strong SASM-strong PSM, the Western Pacific Subtropical High is stronger to the east, the South Asia High is stronger and shifts to the east, the southeastern water vapour transport from the Western Pacific Ocean is stronger, the cyclonic circulation in the Indian Peninsula cooperates with the anticyclonic circulation on the southern side of the Plateau, guiding the water vapour transport from the Bay of Bengal to the southwestern part of the Plateau, the convergent upward movement of the airflow in the near-surface layer of the Plateau is enhanced, leading to more precipitation in the northeastern part of the Plateau and the southwestern edge. The opposite is true for the circulation of strong EASM-strong SASM-weak PSM years, with less precipitation in the central-eastern part of the Plateau. In the weak EASM-weak SASM-weak PSM years, the Western Pacific Subtropical High is weaker and shifts to the west, the South Asian High is weaker, the anticyclonic circulation in the Bay of Bengal transports warm and humid air to the east of the Plateau, the southwestern side of the Plateau has northwesterly airflow, water vapor transport is low, the near ground layer of the Plateau is divergent and sinking airflow, resulting in less precipitation in the southern part of the Plateau. The opposite is true for the circulation of the weak EASM-weak SASM-strong PSM years, with more precipitation in the east-central part of the Plateau and less precipitation in the west. In the strong EASM-weak SASM-strong PSM years, the Western Pacific Subtropical High is weaker and shifts to the east meanwhile the South Asian High is weaker and shifts to the west, the anomalous anticyclone in the Sichuan Basin guides the transport of water vapour from the Western Pacific to the eastern part of the Plateau, while the cyclonic circulation in the Bay of Bengal hinders the transport of water vapour in the southwestern part of the Plateau, the convergent upward movement of the airflow in the southern part of the Plateau leads to more precipitation in part of the areas. The opposite is true for the circulation of the weak EASM-strong SASM-weak PSM years, with more precipitation in the western and north-eastern of the Plateau and less precipitation in the south-eastern part of the Plateau. In the strong EASM-weak SASM-weak PSM years, the Western Pacific Subtropical High is weaker and shifts to the east and the South Asian High is stronger and shifts to the west, the anticyclonic circulation in the Hetao and the Arabian Sea hinders moisture transport from the Western Pacific and the Indian Ocean. The convergence of the surface layer on the south side of the Plateau is weak and controlled by downward movement, resulting in less precipitation there. The circulation situation in weak EASM-strong SASM-strong PSM years is opposite, causing unusually more precipitation in the southeastern part of the Plateau.