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A test device with rectangular channel is developed to study the combustion performance of solid propellant in high temperature particles erosion. The flow fields in this new device and a test device with circular channels are simulated numerically. The particle erosion experiments in these two devices are carried out under different particle concentrations.The results show that the test device with rectangular channel can effectively improve the clarity and precision of combustion diagnosis image and can be used for research on combustion performance of solid propellant under low concentration particle erosion; the circular channel device has good particle convergent effect, provides high concentration particle erosion, and can be used for research on the combustion performance of solid propellant under high concentration particle erosion. The experiment data indicates that the propellant burning rate does not change obviously in lower particle concentration; the propellant with lower static burning rate increases remarkably under particle erosion, while the propellant with high static burning rate is not sensitive to the particle erosion.