Abstract: How to realize output of annual data of forest resources has been concerned for many years. With reference to the methods for producing annual national estimates of forest resources presented in recent years,this paper puts forward the basic principles and technical ideas on output of annual provincial estimates of forest resources,and makes use of the continuous forest inventory(CFI)data of two provinces of Guizhou and Liaoning to carry out the analysis on the approach that one-fifth of the CFI plots throughout the province are measured every year and annual estimates are obtained through moving average method. By comparing the results from different weighting schemes,it was found that the equal weighting estimator with some loss of timeliness had the highest stability and was the best alternative one,which could objectively reflect the changing trend of the annual data of forest resources.

Key words: forest resources, annual data, moving average, timeliness, stability