Kinetic analysis about coupled chemical effects of CO2 and H2 additions on laminar premixed dimethyl ether flames is performed. The coupled chemical effects of CO2 and H2 addition are analyzed on aspects of temperature, major species, intermediate stable species and radicals. The result shows that when H2 is added, the CO2 chemical effects, which can decrease the temperature, the DME oxidation, the production of C2H2, CH2O, CH3CHO and H radical but promote the production of O and OH radicals, would varies directly with the CO2 concentration. However, CO2 addition can strengthen the H2 chemical effects on increasing the temperature and DME consumption, but mitigate the H2 chemical effects on reducing the H mole fraction. And the CO2 concentration did not have obvious influence on the H2 chemical effects on increasing the production of O, OH, C2H2, CH2O and CH3CHO.