Abstract: Model flight test is one of the important methods in aerodynamic research and has become a low-risk and effective technical approach for aerodynamic research and for demonstration and validation of aerodynamic configuration. Nowadays the technology of low speed model flight test becomes more mature but there are still some severe technical problems in the high speed model flight test. It can be seen that the influence of dynamic pressure on model flight test is significant. The dynamic pressure similarity ensures that the scaled aircraft have similar dynamic characteristics with the prototype, but it also limits the flight ability of scale aircraft. In this paper, we can see that with appropriate flight scheme, the scaled aircraft can break the limitation bring by dynamic pressure similarity and obtain equivalent or even better flight performance, compared with the prototype, which has certain guiding significance for the subsequent scaled flight test.