Some ecologycal parameter of natural planting of Prioria balsamifera, Fabaceae/ Caesalpinioideae is studed in Luki and Kiyaka Reserve forest of Agronomie national Institute of Studie and Seart. The floristic inventory, allometrie measures (at dbh) of all individuals of Prioria balsamifera and somes climatic factors, e.g annual mean of rain, temperature, atmosphic humidity, physiography and soil texture are studed. This resultants indique that 194 individuals/ha at Luki and 5 individuals/ha at Kiyaka; 190 individuals stems are arranged in the 10-40 cm diameter arrange and distinguished dead of any individuals of same diameter arranging at Kiyaka Station. The space distribution of Prioria balsamifera is aggregative at Luki Station and aleatory at Kiyaka Station. This terrial area gives 1144, 77 m2 /ha at Luki Station and 6,08 m2 /ha in Kiyaka. This 10-40 cm dbh diameter, whereas all individuals of this class of diameter are remarkably absent. An estimation of aerea biomass elevate at 75,45t/ha and 37,72t/ha carbon stock with 127t/ha at Luki Station and 42,6t/ha of aerial biomass: 21,30t/ha of the carbon stocked and 71,74t/ha at Luki of carbon equivalent at Kiyaka Station.