Abstract: The reflection of oblique detonation is an important phenomenon in the combustor of oblique detonation engines. To deeply understand the structural characteristics of the reflected wave system of oblique detonation, this paper conducts a numerical study on the reflection phenomenon of oblique detonation waves induced by the diffraction of normal detonation waves using a block structured adaptive mesh refinement program. By solving the two-dimensional Euler equations with chemical reactions, the reflection process of oblique detonation waves driven by normal detonation waves was studied. The effects of different driven section heights (2, 3, 4 cm), initial premixed gas pressures (20, 40, 50 kPa), and premixed gas equivalence ratios (0.2, 0.35, 0.5, 0.65, 0.8) on the wave front reflection characteristics were comparatively investigated. The results showed that the normal detonation wave drived and induced the formation of oblique shock waves and oblique detonation waves in the premixed gas, which underwent four typical processes: detonation diffraction, regular reflection, transition from regular reflection to Mach reflection, and Mach reflection-induced detonation waves. Moreover, the Mach reflection structure exhibited self-similarity. As the height of the driven section increased, the enhanced lateral expansion effect weakened the diffraction shock wave and the induced combustion intensity within the driven section, correspondingly weakening the regular reflection and Mach reflection. As the initial pressure of the premixed gas increased, the angle of the oblique shock wave formed by detonation diffraction decreased, delaying the transition from regular reflection to Mach reflection. As the equivalence ratio of the premixed gas in the driven section increased, the driven section experienced three different states: weakly unstable combustion induced by the diffraction shock wave, transition from strongly unstable combustion induced by the diffraction shock wave to oblique detonation, and diffractive oblique detonation.