[Objective] The forest type differentiation characteristics and spatial patterns of the forest water conservation function in Sichuan area of Giant Panda National Park were studied in order to provide guidance for the protection of forest resources and adaptive management of water resources in this area. [Methods] Based on the results of the cadastral and special forest resources survey in Sichuan area of Giant Panda National Park, sample plots data and multi-source remote sensing data, the integrated storage capacity method was applied to estimate the forest water conservation function. And its characteristics under different forest types and site conditions were then analyzed. [Results] (1) The water conservation amount of forest ecosystem in this area was 1 708.49×106 m3, yielding a water conservation of 1 061.27 m3/hm2 per unit area. The soil layer served as the main reservoir for water conservation. Evergreen coniferous forest exhibited the strongest water conservation function. (2) There were notable spatial variations in forest water conservation function, with higher levels in Ya’an City, Mianyang City, and Guangyuan City, and lower levels in Aba Prefecture and Deyang City. (3) The forest water conservation amount mainly concentrated in areas with altitudes of 1 500–3 500 meters, contributing 90.10% to the total water conservation amount. And the forest water conservation per unit area significantly decreased as altitude increased (p<0.01). (4) Forests on steep slopes (36-45°) had the highest forest water conservation amount, with a contribution rate of 24.01%. The forest water conservation per unit area showed a trend of first increasing and then decreasing as slope steepness increased (p<0.01). [Conclusion] Reasonably adjusting the forest resources structure and optimizing forest resources distribution in Sichuan area of Giant Panda National Park according to local conditions would help to maximize the forest water conservation function in this area.