Abstract: In order to understand the effects of thinning on the growth of Calligonum arborescens and the soil watersalt distribution in Tarim Desert Highway shelterbelt, a thinning experiment was conducted on an aged and declined C. arborescens woodland in a demonstration section of the shelterbelt, with the growth of C. arborescens and the soil watersalt distribution monitored. Thinning had no effects on the phenophase of  C. arborescens, but after thinning, the growth of the current year plant height, crown width, ground diameter, and new branch length of reserved trees was larger than that of the control, and the increment was in the order of planting space 2 m×1 m > 1 m×1 m > the control, with significant differences among the treatments. The assimilation branch surface area in treatments 2 m×1 m and 1 m×1 m were 5.97 m² and 5.22 m² per plant, respectively, being significantly larger than the control (3.1 m² per plant). The soil moisture content in 0-160 cm layer was significantly higher in treatments 2 m×1 m and 1 m×1 m than in the control, and increased obviously with thinning intensity. The soil salt content was in the order of control > planting space 1 m×1 m > 2 m×1 m, and the differences among the treatments were significant. It was suggested that the best reserved plant density after thinning was planting space 2 m×1 m.