Abstract: The flow distribution in an annular combustor at different Mach numbers and heating ratios was investigated experimentally.An empirical relationship for coordination between the cold and the hot flow distributions has been established with the aid of the least square method based on the experimental results. The data calculated are in good agreement with the test ones.Therefore, the aim of the study is realized that the empirical formula enables us to predict the combustor flow distribution at different Mach numbers and heating ratios according to the flow distribution at a given low Mach number with cold air flow.