Effects of tree age and cutting diameter on survival rate of Tamarix austromongolica Nakai cuttings were researched, and rooting position of cuttings was observed. The results show that survival rate of T. austromongolica cuttings decreases with increasing of tree age (1-3 a, 5-10 a and 400-500 a) and with reducing of cutting diameter (0. 8-1. 4cm, 0. 5-0. 8 cm and less than 0. 5 cm). In which, survival rate of cuttings with tree age 1-3 a and diameter 0. 8-1. 4 cm is the highest with a value of 84. 13% , and that with tree age 400-500 a and diameter less than 0. 5 cm is the lowest with a value of 25. 43% . Rooting model of T. austromongolica cuttings has two types, which can root from cortex and callus of cuttings, meaning that the cuttings have stronger rooting ability. It is suggested that cuttings with diameter above 0. 5 cm should be selected for cutting propagation of T. austromongolica ancient tree.