In order to understand the effects of N addition with different chemical forms on greenhouse gas (CO_2, N_2O and CH_4) emission from the alpine shrub meadow on Qinghai-Tibetan Plateau. Four treatments including a control (CK), no nitrogen plus three forms of nitrogen (NH_4Cl, NH_4NO_3, KNO_3) were applied in Hongyuan County, eastern Qinghai-Tibetan Plateau. A composite sample of the top 15 cm of soil taken from each treatment was incubated at the lab at 15℃. Emissions of CO_2, CH_4 and N_2O from the incubated soil and the soil mineral nitrogen (NH_4~+ and NO_3~-) and dissolved organic carbon (DOC) were determined. The results showed that all the nitrogen addition treatments inhibited soil CO_2 emission which was significantly, positively correlated with soil DOC concentration. Addition of nitrogen significantly increased soil N_2O emissions, the highest N_2O emissions were found with NO_3~--N addition. There were no treatment differences in soil CH_4 absorption. The results suggest that application of NH_4~+-N rather than NO_3~--N will reduce greenhouse gas emissions in Tibetan alpine shrub ecosystems.