Abstract: Development of an oil field often causes pollution to its surrounding areas, negatively affecting the ecological environment therein. The development of Songfangtun Oil Field is cited as an example for the study to illustrate its impact on the surrounding pastures and the regularity of pasture restoration. Results show that during the processes of drilling, oil extraction, storage, conveyance and various other operations, large quantities of pollutants were generated, seriously polluting the pasture and affecting the growth of forage grasses. It takes 4-5 years for the pasture to restore the dominance of Aneurolopidium chinensis in drilling sites of chernozem and aeolian sand soils.