<p>While the most severe persistent heavy precipitation events (PHPs) frequently occur over the Southeastern Tibetan Plateau (SETP) during summer, the physical mechanisms underlying the intensity change of PHPs remain elusive. Here, the upstream evaporative moisture uptakes (UEMU) anomalies for categorized PHPs over SETP are identified and compared under the framework of Lagrangian modeling and moisture tracking. The results show that both types of PHPs are characterized by a similar pattern of UEMU anomalies, with the southeastern Asia continent acting as the upmost contributor. However, the anomalies in UEMU associated with strong PHPs exhibit discernable discrepancy in magnitude and spatial distribution compared to weak ones. Specifically, strong PHPs are comparably fueled by more evaporative vapor from remote regions upstream but less from local recycling. Though the local recycling make significant contribution to both types of PHPs, our results highlight the dominant role of large-scale drivers in modulating the intensity of PHPs over SETP, including the strength of middle-high latitudinal wave trains and low-latitude Western Pacific Subtropical High.</p>