Abstract: To systematically evaluate the long-term effects of the innovative cultivation model "Single-Plant Cultivation, Whole-Canopy Training" (sparse planting with height retention → single-plant fixed planting → whole-canopy cultivation → ecological rotational harvesting) on the ecosystem stability and tea quality of Tieguanyin (Camellia sinensis var. Tieguanyin) tea gardens, this study employs long-term fixed-position observation to focus on analyzing the interaction effects between canopy structure and environmental factors under cultivation mode regulation, as well as their dynamic influence mechanisms on tea plant physiological metabolism and quality component accumulation.,In 2016, a comparative field trial was conducted in tea plantations at Juyuan Village, Longjuan Township, Anxi County, Fujian Province (25°03′N, 118°11′E).Two plots with consistent site conditions were selected-Plot A adopting conventional dwarfing and dense planting, and Plot B employing the "Single-Plant Cultivation, Whole-Canopy Training" model. The results showed: (1) Yield Dynamics: Short-term (2019–2020): Plot A exhibited significantly higher shoot density (1,565.0 vs. 1,512.3 shoots·m^-2), 100-shoot weight (14.18 vs. 13.69 g), and fresh leaf yield (P<0.05). Long-term (2021-2024): Plot B demonstrated a substantial yield increase, reaching 924.68 kg·hm^-2 by 2024, surpassing Plot A (812.57 kg·hm^-2) by 13.8% (P<0.05). (2) Quality Improvement: The polyphenol-to-amino acid ratio in Plot B (11.56) was significantly lower than in Plot A (12.57), indicating enhanced freshness and umami in the tea liquor. Sensory evaluation (2024): Plot B scored 4.1 points higher (91.82 vs. 87.72, P<0.05), with pronounced improvements in aroma and taste. Conclusion:  The SPC-WCT (Single-Plant Cultivation, Whole-Canopy Training) model initially yielded lower outputs but achieved synergistic improvements in productivity, quality, and ecosystem health over time. This model establishes a "production-ecology-culture" trinity conservation paradigm for Globally Important Agricultural Heritage Systems (GIAHS), providing a scientific basis for the sustainable management of Anxi Tieguanyin tea plantations.