The article reviews the key parameter testing technologies for air⁃breathing pulse detonation engines under unsteady combustion conditions. It elaborates on the methods for measuring detonation wave pressure and gas velocity, explores the research status of piezoelectric and piezoresistive sensors as well as optical technologies, and analyzes the challenges faced by these technologies in high⁃temperature and high⁃frequency environments. The current state of the research on the measurement of pressure ratio and combustion efficiency is analyzed, and high⁃precision measurement schemes based on the mass⁃weighted average method and optical technologies are discussed. Dynamic testing methods for turbine speed and efficiency are introduced, the reasons for turbine efficiency decline under unsteady conditions are analyzed, and the design optimization suggestions are proposed. The latest advancements in thrust measurement technologies are summarized, and the high⁃precision thrust measurement methods based on dynamic system parameter identification and deconvolution techniques are elaborated. Finally, the future development directions of unsteady parameter testing technologies for pulse detonation boosted engines are envisioned, including improving the anti⁃interference capability of sensors and optical devices, optimizing combustion chamber design, developing dynamic testing systems with higher temporal and spatial resolution, and researching more intelligent multi⁃parameter integrated measurement systems. These efforts aim to further enhance the accuracy and reliability of unsteady parameter testing technologies for pulse detonation boosted engines and promote their engineering applications.