The purpose of this study is to establish the integrated province-city-county forest carbon storage estimation technology system of Guangdong,and provide a method reference for local government to measure forest carbon storage.This study used forest sample plot survey data of the ninth national forest resources continuous inventory of Guangdong Province in 2017,established a simultaneous prediction model with forest volume,biomass and carbon storage as target variables,and stand basal area and stand average height as explanatory variables,each model's determination coefficient R² was above 0.94,MPE average forecast error was less than 3%.The average percentage standard error (MPSE)was less than 15%,and the evaluation indexes showed that the model had high practicability.Based on the sub-class data of 2018 second-class forest resources survey in Guangdong Province,supported by model technology and data coupling technology,the forest reserves of Guangdong Province were translated into forest map patterns in forest resources archive data,and then aggregated into villages,towns,counties,cities and provinces step by step,realizing provincial-city-county integration under the national framework system.The results showed that the system coupling method of carbon storage estimation technology established was scientific and feasible,and the prediction model had high accuracy,which could be popularized and applied in the assessment and evaluation of carbon neutralization goals of provinces,cities and counties.