In order to solve the problems of coking and high initial NOx concentration in the municipal solid waste (MSW) incinerator, high temperature and low oxygen combustion technology in the furnace of MSW incinerator was adopted, and its feasibility was discussed. Eleven high temperature and low oxygen nozzles were set on the front arch of the conventional waste incinerator. Four cases with different flow rates at 60, 50, 40 and 30 m/s respectively were investigated by computational fluid dynamic (CFD) numerical simulation. The results show that with the jet velocities of 60 m/s and 50 m/s, the entrainment and mixing capability of the jet fluid is stronger. The leading edge of jet can almost reach the surface of the grate,and the resulting flow vortex covers the high temperature section of the main combustion area (the combustion section on the grate) . The gaseous components are mixed much more evenly in the main combustion area with the oxygen concentration in the range of 6.5% ~7.0% (volume fraction) . The temperature profile in the main combustion area (about 1 200 K) is more uniform and characterized by smaller high-temperature-zone, which can help reduce the coking risk and the initial NOx concentration in the incinerator.