The paper focused on the soil profile characteristics and soil physico-chemical properties of different degradation grades in the northwest of Sichuan Province.Results showed that the meadow layer of soil profile became smaller,vegetation coverage was declined,and good pasturage was gradually decreased in variety and quantity with increased steppe degradation grades.The contents of organic matter and humic acid showed a downtrend and meanwhile,FA/HA increased gradually.Among soil nutrient substances,the contents of total nitrogen,available nitrogen,total phosphorus,available phosphorus,and available potassium showed a declined tendency.The content of total potassium showed a slight uptrend,but the change was not obvious.Soil pH value also showed a slight uptrend and the pH value of surface layer was less than the value of subsurface layer.