Twelve Populus tomentosa triploids and diploids were identified by AFLP molecular technology using a MseⅠ+3/EcoRⅠ+2 primer combination.Twelve primers with high amplified bands were selected from 38 primer combinations,including primer M——CAT/E——TC with the highest ratio of polymorphic sites(32.4%) as well as primer M——CTT/E——TT with the lowest ratio of polymorphic sites(15.7%).The genetic relationships among the 12 materials are relatively close.The dendrogram result of 12 clones constructed with a UPGMA me...