Through the CO_2 concentration(2009 - 2014) in soil and air under different vegetation conditions at Jiangxigou township of Gouhe Country,the changes in the area of soil CO_2 concentration characteristics,rules and its main influencing factors were researched in the present study. The results showed the CO_2 concentration change of different vegetation with the same depth: CO_2 concentration of tall prairie grass was significantly higher than bare ground; And the hour average concentration of tall prairie grass was 4.74 times of bare ground and changes in the lush meadows of the high CO_2 concentration curve is much gentler. The temperature was the main factors affecting soil CO_2 concentration in the area. Through statistical analysis,CO_2 concentration and temperature change had a significantly positive correlation. With global warming,soil CO_2 concentration will increase.