There has been a longstanding debate on whetherplutonic and subvolcanic rocks have a petrogenetic connection, and the Jurassic Shuikoushan caldera complex in SouthChina serves as an ideal case study for unraveling this geological puzzle. SIMS U–Pb dating of zircon indicates the formation age of plutonic (granodiorite) and subvolcanic rocks(dacite porphyry and rhyolite porphyry) from the Shuikoushancaldera complex at ca.159 Ma. In terms of geochemical composition, granodiorite and dacite porphyry exhibit higher levelsof MgO (1.98–3.63%), MnO (0.07–0.11%), FeOt (5.12–6.15%), Sr(342–547 ppm), and Ba (754–1200 ppm) compared to the rhyolite porphyry. Conversely, they show lower concentrationsof Rb (2.04–27.1 ppm), as well as lower ratios of Rb/Sr(0.004–0.055) and Rb/Ba (0.004–0.023). The distinct but complementary geochemical characteristics between these rocktypes are evident in the Shuikoushan caldera complex.Overall, zircon grains from all three rock types exhibitsimilar negative εHf(t) values (–8.1 to –12.4) with high δ18Ovalues (8.3–9.7‰), suggesting a common source region。Based on lithological and geochemical evidence, it is proposed that the rhyolite porphyry represents extracted meltfrom the mush reservoir. In contrast, the granodiorite anddacite porphyry are residual melts enriched in cumulates. Thisinterpretation supports the idea that crystal–melt segregation processes were crucial in connecting the late Jurassic subvolcanic and plutonic rocks within the Shuikoushan complex.