The results indicated that the mechanical strengths of No1 group (flooded for one month) were nearly all higher than that of No2 (flooded for two months),and nearly all the discrepancies of them were significant at 005 level.Based on the property grade,all the properties of the wood were lower than that of middle grade.Principal component analysis on physical and mechanical properties of wood of Pterocarya stenoptera indicated that the shrinkage was the first prinicipal component and the mechanical str...