Abstract: Experimental study of combustor of heavy-duty gas turbine(E) was conducted on high-pressure test system.The content of CO and UHC was very low,the combustion was stable and efficient,with the combustion efficiency over 99% and pollution emissions(NO_x) up to 204mg/N·m³(15%O₂) under rated condition.But,this couldn't meet the design requirements.The results indicate that: the radio of on-watch-fuel is large,which makes the content of NO_x larger;uneven premixed fuel is another important reason that makes the content of NO_x larger.The conclusion has provided a reliable basis for gas turbine's design and development.