Investigation of the effects of land-use change on soil CO_2 and N_2O fluxes under the conversion of cropland to forest and grassland in loess hilly region would be helpful to understand the context of global warming.Using static chambers method,soil CO_2 and N_2O fluxes were investigated during the growing season under three land-use types(cropland,jujube orchard and abandoned grassland)in the study area in 2014. Additionally,soil temperature and moisture at 10 cm depth were monitored using mercurial thermometer and potable time domain reflectometry respectively to explore the correlations between environmental factors and soil gas emissions.During the growing season,the emission rates of CO_2 in cropland,jujube orchard and abandoned grassland were 110.66~531.79mg/(m~2·h),74.01~437.27 mg/(m~2·h)and 52.56~267.20 mg/(m~2·h),respectively,which peaked in summer and were correlated with soil temperature in all land-use types.Soil N_2O under different land-use types followed similar seasonal patterns which were related to vegetative growth,the higher emission rate occurred in June and July compared with other growing period when negative fluxes frequently occurred,and the values varying-3.82~19.78mug/(m~2·h),-4.21~28.10mug/(m~2·h),-8.77~16.76mug/(m~2·h)in cropland,jujube orchard and abandoned grassland,respectively. Linear correlation analysis showed that,for both land-use types,relationship between soil CO_2(N_2O)fluxes and soil temperature at 10 cm depth was better than the relationship between soil CO_2(N_2O)fluxes and soil moisture,while no relationship was found between soil N_2O flux and soil moisture due to the complicated mechanism of nitrification and denitrification processes.Moreover,binary linear regression analysis on the relationship of soil temperature and soil moisture could explain 54%~78% of soil CO_2 seasonal variations. Our research results showed that soil N_2O increased(p<0.01)with the better substantial condition after converting cropland into grassland,however,no statistics difference was observed in the case of CO_2 emissions,which were probably caused by the low temperature in grassland.The conversion of cropland to orchard led to the lower soil CO_2 and N_2O emission rates(42.1%~92.7%)due to intensive field management which may also contribute to more negative flux of N_2O in economic forest.