Erosion is one of the most important phenomena in desertification. Whether this erosion happens by wind or water, soil not only becomes poor in the case of material nutrition, but also causes sediments in reservoirs, and is a serious danger for human life. In order to determine the effects of roots of two arid plant on reduction of soil erosion, a pot study conducted in split plot on complete randomized design in Isfahan University of Technology. This study consisted of three treatment of waters as top water, mixed top water and wastewater|(50%-50%) , two plant types of Crassula and Haloxylon, a selected soil from Isfahan Airport District with clay sandy loam texture, three pressure forces of 0.2 , 0.6 and 1 Kg/cm 2 in order to determine of soil shear resistance with eight replications. This study carried out with 144 plastic pots. The results showed that in each three applied irrigations, Crassula has more reduction in soil erosion than Haloxylon, and causes to increase shear resistance. soil cutting resistance. Whatever the amount of wastewater in applied water increased, the amount of root, mean root diameter, its volume and total length had significantly increased and this increase affected more Crassula than Haloxylon.The treatment of Crassula irrigated with wastewater caused soil shear resistance of 0.22 Kg/cm 2 was the best treatment for reducing soil erosion at the end of the growing seaso due to its high root density and its woody roots. The treatment of Haloxylon irrigated with top water caused soil shear resistance of 0.13 Kg/cm 2 had the least effects on reduction of soil erosion as compared to other treatments at the end of the growing season.