The evolution of carbon dioxide (CO2) from soils is due to the combined metabolic activity of microorganisms. Different ecological factors can effect on the rate of CO2 evolution include soil erosion. The specific objectives of the present study were to examine the impacts of soil erosion on soil CO2 evolution and to determine seasonal patterns in soil CO2 evolution. We measured soil CO2 evolution under different level of erosion in semi arod soils of Uzbekistan. Soils were taken from different eroded sites of Uzbekistan, such wind erosion, and water erosion and from different soil depth. Soil CO2 evolution was measured in April, June, and October 2004. Significantly higher soil CO2 evolution was observed in the spring at 0 – 5 cm soil depth. In spring, integrated daily values for CO2 evolution ranged from 1.81 to 2.03 mg CO2 per 100 g soil for 1 h. Water erosion decreased soil CO2 evolution I spring as well in winter perio (1.02 – 1.31 mg CO2 per 100 g soil for 1 h) The CO2 evolution were differ at various soil dept. It decreases from 5- 15 cm to 50 – 70 cm soil depth. Soil CO2 evolution were correlated with activity of soil microorganisms and ferments. In water eroded soils also soil biological activity decrease to compare no eroded soils. They were very active in spring time.