WenJun Zhang School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China Computational Ecology and Software ISSN 2220-721X http://www.iaees.org/publications/journals/ces/online-version.asp 2027 17 1 1 29 International Academy of Ecology and Environmental Sciences Hong Kong 19 May 2026 20 June 2026 1 March 2027 Gross Ecosystem Product (GEP) measurability standardized accounting uncertainty analysis national accounting ecological compensation Gross Ecosystem Product (GEP) accounting is increasingly mandated for carbon trading, watershed eco-compensation and performance audits of natural resource management, however reported values for the same region often diverge by several orders of magnitude, eroding policy credibility. This discrepancy originates in a chain of measurement discontinuities that separate ecological processes from final monetary estimates. The present study argues that the core challenge is not data scarcity but the absence of a measurability-oriented accounting paradigm. I propose a standardized construction that organizes the accounting pipeline into a sequence of process modelling, data assimilation, physically verifiable service flows and stepwise calibration. The framework introduces a formal hierarchy of measurability for ecosystem services, modular accounting protocols with built-in uncertainty propagation, and bridging rules that connect GEP satellite accounts with the System of National Accounts. The standardized protocol will reduce inter-operator variance to within a policy-tolerable range while producing defendable interval estimates validated against gauge observations. The results provide a route toward converting GEP from a fuzzy negotiation token into a measured, auditable quantity suitable for carbon neutrality accounting and ecological compensation. http://www.iaees.org/publications/journals/ces/articles/2027-17(1)/standardized-construction-of-ecosystem-service-accounting.pdf