In order to measure the velocity field of high-heat and high-speed jet flow quickly and accuratelya measurement method of velocity field for combustion exhaust plume based on particle tracing is proposed. By actively adding metal particles with gray body radiation characteristics to the exhaust plumehigh-speed imaging is carried out by adopting appropriate observation parametersand the maximum cross-correlation degree of particle images is evaluated by combining gray distribution cross-correlationso as to obtain the velocity of flow field. The coaxial jet flame system is applied to the experimental research of the velocity measurement. The results show that the relative deviation between the measured value and the one-dimensional theoretical value at flow velocity of 90~140m·s-1 is less than 5%and the relative deviation of flow velocity measured at particle blowing speed of 0.02~0.1m·s-1 is less than 0.35%. It is verified that the method is suitable for similar application scenarios of velocity field measurement for exhaust plume in aero-engine test.