Abstract: The Yangtze River Basin in July-August 2022 experienced a record-breaking extreme high-temperature event. Using the ERA5 reanalysis data and CN05.1 grid point data, the spectral analysis identifies the low-frequency feature containing 30–64d in this high-temperature event and linear regression showed that the Eurasian subtropical teleconnection and two key Tropical convection activities in the region have an important connection with this high-temperature event. Further analysis using a linear baroclinic model revealed that abnormal convection over the Arabian Sea-Pakistan area and the South China Sea played critical roles in modulating the atmospheric circulation over the Yangtze River Basin at different stages of the heatwave through teleconnection patterns. Specifically, during the positive and negative phases of the low-frequency cycle, enhanced convective activities near the Arabian Sea-Pakistan region modulated the upper tropospheric subtropical Rossby wave train in the north, thereby affecting downstream circulation anomalies over the Yangtze River Basin. Conversely, convective anomalies in the South China Sea initiated Rossby waves that influenced the basin via the Pacific-Japan teleconnection pattern. During the negative phase of low-frequency temperature cycles, weakened convection in the South China Sea predominated, placing the Yangtze River Basin within an anomalous cyclonic circulation with meridional cold advection, leading to cooling in the region. Contrary to the response to the convection in the Arabian Sea, the Yangtze River Basin is located in a cyclonic circulation with abnormal positive vorticity, zonal cold advection promotes cooling in the region; during the positive phase of the low-frequency temperature. the response to the strengthened convection in the South China Sea and the strengthened convection in the Arabian Sea is a synchronous phase, and the Yangtze River basin is located in an anticyclonic circulation with anomalous negative vorticity. At this time, the Yangtze River basin is located on the southerly side within the anticyclonic circulation, the sinking adiabatic motion and meridional warm advection strengthens the positive temperature anomaly in this period. This study elucidates the impact mechanisms of extreme high-temperature events in the Yangtze River Basin and provides insights for forecasting future summer extreme temperature events.