Abstract: In this paper, a block-structured adaptive mesh refinement program was used to conduct numerical simulations of the reflection phenomenon of obliquely detonated waves induced by diffraction. By solving the two-dimensional Euler equations with chemical reactions, the reflection process of obliquely detonated waves driven by normal detonation waves was studied. The effects of different driven section heights, premixed gas pressures, and premixed gas equivalence ratios on the wave front reflection characteristics were comparatively investigated. The results show that the normal detonation wave drives and induces the formation of oblique shock waves and oblique detonation waves in the premixed gas, which undergo 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 exhibits self-similarity. As the height of the driven section increases, the enhanced lateral expansion effect weakens 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 increases, the angle of the oblique shock wave formed by detonation diffraction decreases, delaying the transition from regular reflection to Mach reflection. As the equivalence ratio of the premixed gas in the driven section increases, the driven section experiences 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.