Abstract: Generated through 13 years study，a Ulmus pumila superior clon e#65212 has been chosen．It is not only resistant to Pyrrhalta aenescens lalva but also growing fast with fine trunk form．Feeding P．aenescens lalva with the leaves of #65212 in the laboratory,the dead ratio of lalva is 86.44％—93.41％，which is 269.14％—479.50％ higher than that of control (8052)．The number of pupae in 8—9 years old trees is lower 93.9％—97.7％ than that of control in average and the harmful in-dex of leaf area is 90.67％ lower than that of control．The trunk height，volume，form parameter at breast height ate 3.91％—38.65％,17.47％—80.80％，12.72％—43．69％higher than those of 8052，8015 respectively．Its characteristics of rapid growth and resistance to pest can be passed to their hybrid descendents．

Key words: Ulmus pumila, Resistance clone, Pyrralta aenescens