The 55a Castanopsis carlesii forest by AMPR (Artificial Measures Promoting Regeneration) was stratified obviously to 2 sub-strata (sub-stratum I and sub-stratum II) by MLRP (Maximum Light Receiving Plane) method.The tree height in sub-stratum I was higher than or equal to 17.6 m.It was typical mono-dominant community which was composed by 25 tree species and the important value of Castanopsis carlesii (the dominant tree species) was 150.96%.There was 7 and 25 tree species in sub-stratum I and sub-stratum II respectively.The important value of Castanopsis carlesii (the dominant tree species) in sub-stratum I was 218.20%.Its species richness (R),Shannon-Wiener index (SW),evenness (E) and ecological dominance (ED) in tree stratum were 25,2.92,0.63 and 0.29 respectively,with in sub-stratum I were 7,1.08,0.23 and 0.68 respectively,in sub-stratum II were 25,3.95,0.85 and 0.10 respectively.Its average stand DBH,height,density and growing stock in tree stratum were 24.69 cm,23.11 m,1 208 N/hm ² and 612.73 m³/hm² respectively.Its average stand DBH in sub-stratum I and sub-stratum II were 32.84 cm and 10.99 cm respectively.Its average stand height in sub-stratum I and sub-stratum II were 24.31 m and 11.99 m respectively.Its percentage of stand density in sub-stratum I and sub-stratum II were 51.03% and 48.97% respectively.Its percentage of growing stock in sub-stratum I and sub-stratum II were 94.46% and 5.54% respectively.