Abstract:Research on the rooting properties of 5 new clones of Populus euramericana shows: 1. The clones initiate a great number of root primordia, rooting early and with many lateral roots and long adventitious roots. The rooting percentages of these clones are high. The rooting performance is apparently better than that of the parents, P. deltoides Bartr. Cv. Lux and P. nigra. 2. The high general haritability of rooting percentages shows that rooting properties are mainly controlled by inherity. 3 . Temperatures from 20 to 25℃ are good for rooting. 4. Sufficienc water content of the cuttiug is the necessary condition for rooting, and water decifit is an important faclor of reducing rooting percentage. Whereas water soaking is a simple and effective method for increasing viability of the cutting.