Effects of the compressed pressure and fuel concentration on ignition delay of DME mixture were investigated using a rapid compressor at compressed temperature of 656—814 K, compressed pressure of 1.2—3.5 MPa and equivalence ratio(φ) of 0.83—1.25. Kinetics model was built to predict the ignition delay and simulate the combustion process using CHEMKIN-PRO software, meanwhile, reaction kinetics analysis was conducted. The results show that with increasing compressed pressure and fuel concentration, the first-...