Kinetic analysis of coupled effects of CO_2 and H_2 additions on laminar lean premixed dimethyl ether flames is performed at atmospheric pressure. The coupled effects of H_2/CO_2 additions on major species, intermediate stable species and radicals are discussed and analyzed in detail. The dilution, thermal and chemical effects of H_2 and CO_2 are separated and identified. The results show that H_2 addition can slightly mitigate the CO_2 chemical effects on decreasing the temperatures, H radical concentration, acetylene mole fraction and formaldehyde concentration. After CO_2 is added, the H_2 chemical effects on increasing the temperatures are enhanced. DME oxidation is promoted by the H_2 chemical effects, which is further strengthened by the CO_2 addition. Moreover, CO_2 addition can reduce the H_2 chemical effects on increasing the H radical mole fraction, but strengthen the H_2 chemical effects on increasing the production of HO_2 and C2H_2. CH_2O formation can be promoted by the H_2 chemical effects, which is enhanced by the CO_2 addition. In actually, the H_2/CO_2 coupled chemical effects almost have no obvious influence on the temperatures and HO_2 mole fraction. DME consumption is delayed by the H_2/CO_2 coupled chemical effects. Furthermore, the H_2/CO_2 coupled chemical effects can decrease the H radical mole fraction, CH_4 concentration, C_2H_2 mole fraction, CH_2O concentration and CH_3CHO mole fraction, but increase the CO concentration. Kinetic analysis of coupled effects of CO 2 and H 2 additions on laminar lean premixed dimethyl ether flames is performed at atmospheric pressure. The coupled effects of H 2 / CO 2 additions on major species, intermediate stable species and radicals are discussed and analyzed in detail. The dilution, thermal and chemical effects of H_2 and CO_2 are separated and identified. The results show that H_2 addition can slightly mitigate the CO_2 chemical effects on decreasing the temperatures, H radical concentration, acetylene mole fraction and formaldehyde concentration. effects on increasing the temperatures are enhanced. DME oxidation is promoted by the H 2 chemical effects, which is further enhanced by the CO 2 addition. Moreover, CO 2 addition can reduce the H radical chemical fraction on the H radical mole fraction, but strengthen the H 2 chemical effects on increasing the production of HO_2 and C2H_2. CH_2O formation can be promoted by the H _2 chemical effects, which are enhanced by the CO_2 addition. In fact, the H_2 / CO_2 coupled chemical effects almost have no obvious influence on the temperatures and HO_2 mole fraction. DME consumption is delayed by the H_2 / CO_2 coupled chemical effects. the H 2 / CO 2 coupled chemical effects can decrease the H radical mole fraction, CH 4 concentration, C 2 H 2 mole fraction, CH 2 O concentration and CH 3 CHO mole fraction, but increase the CO concentration.