Spray cooling is an extremely effective method of heat transfer enhancement.There is a wide range of applications in industrial production.By taking the plate as the objects of study,two experiments of heat transfer have done. Fanshaped nozzle was used on plate separately for the singlephase heat transfer that air and water acted as working medium,and the twophase heat transfer that airwater acted as working medium.Base on the experimental condition of air and water pressures that pa/pw≤20,the influence of liquid flux and gas flux effect on steel plate cooing speed were discussed in detail.Through theoretical analysis and experimental data,the variation laws of spray cooling speed are explained.