Abstract: To study the heat-transfer characteristics of high temperature and high speed jet impinging a plate, simulations and experimental research were conducted to verify the validity of the SST-SAS model. On this basis, the effectsof factors likeinlet boundary (turbulence intensity I, gun exit <i<D</i<, velocity to temperature ratio), jet-to-plate spacing <i<H/D</i<, plate inclination angle <i<θ</i<, plate temperature <i<T</i<<sub<w</sub< on the Nusselt number and high temperature jet impinged area were studied. Then, the average Nusselt number of the high temperature jet impinged region was statistically analyzed. The results show that I, <i<u</i<<sub<0</sub</<i<T</i<<sub<0</sub<, <i<H/D</i< and<i< θ</i< have a great effect on the Nusselt number and high temperature jet impinged area; but the impact of <i<D</i< and <i<T</i<<sub<w</sub< was limited. In addition, the change of average Nusselt number of the high temperature jet impinged area is contrary to that of the high temperature jet impinged area,and its numerical value is one magnitude greater than the low temperature and low velocity jet impingement, and the value range is 1 321 to 3 873.