Ecosystem is temporally and spatially in a higher scale.resulting in difficulty and delay to be integrated.Global issues on natural resource management and conservatioa ecology have brought the agenda for a transition of human thinking.The concept of PES( payment for ecosystem services) and especially PWS ( payment for ecosystem services) has been adopted widely since mid 1980s to recognize and practice this transition.Aside with nearly half failure and controversial perspectives,the only surviving common understanding on PES is its essence being an "incentive" based mechanism.As its importance to ecosystem management as realized,PWS practice should be gradually developed capable to tackle the key questions of ecosystem management,especially the nature of complexity,and requirement of being adaptive and integrated for the goal of sustainable development.On this regard,this study reasons qualitatively the abstract relationship between the driven factor "incentive" and the objective factor "integrity" in PWS mechanism.The analysis considers integrity as a composed indicator resulted in a balanced manner" from decomposed patterns of resource allocation in the PWS project site and decomposed participatory incentive patterns from PWS project stakeholders,among three subsystems (economic system,ecosystem and social system) and their goods and services.The preliminary result shows that higher integrity is associated with higher incentive for social services.If higher integrity is likely to increase watershed services,incentive for social services will be a key for increasing watershed services.