Abstarct: The petroleum materials released from corroded old pipelines would pollute soils, shallow groundwater and air as a consequence, threat the health of human and environment. Therefore, the removal of these compounds from environment is vital. The stability of these pollutants at the soil and their gradual accumulation over time would disrupt the normal function of the soil, such as reduced agricultural capability. In this research the influence of two plants species (Bromus tectorum L. and Festuca arundinacea) with different amendments including arbuscular mycorrhizal fungi, alfalfa residues and nutrient solution on the degradation rate of petroleum hydrocarbons in soil were studied. The results showed that,The highest EC were found in mycorrhizae + alfalfa powder treatment (M+A) and there was not remarkable difference among the other treatments. Microscopic studies of the roots showed that both plants were able to make a symbiotic association with arbuscular mycorrhizal fungi in polluted soils.The mycorrhizal colonization percentage in the roots of both plants was significantly higher in (M+S) and (M+A) treatments. These increases in M+S and M+A treatments, compared to the C were 262.35% and 173.13% in B. tectorum L. and 197.88% and 464.87% in F. arundinacea, respectively. The shoot dry weight ranged These increases in M+S and M+A treatments, compared to the C were 209.94% and 164.21% in B. tectorum L. and 222.89% and 539.03% in F. arundinacea, respectively. arundinacea, being the lowest in C and the highest in M+A. The results showed that F. arundinacea in A and M treatments and both plants in M+S and M+A treatments decreased significantly TPH concentration in the soil compared to unplanted treatment. The most effective treatment in removing PHs from the soil was B. tectorum L. when treated with M+S and M+A, compared to the C, with the degradation rates of 83.27%. and 77.6%, respectively. The results showed that F. arundinacea in M+A treatments decreased significantly PAHs concentration in the soil compared to unplanted treatment. The most effective treatment in removing PAHs from the soil was B. tectorum L. when treated with M+S compared to the no plants and treatments, with the degradation rates of 82.97%.