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In order to study the detonation stability of continuous rotating detonation engine, an experimental study was carried out on three annular slots of different area ratios, using hydrogen as fuel and air as oxidant. Based on the high frequency pressure signal, the influence of the annular slot area ratio on the detonation parameter stability was analyzed. The experimental results show that when the area ratio is 0.08, the detonation wave propagates in a double-wave colliding mode, and the peak pressure is in the range of 0.3-0.9MPa. When the area ratio is 0.16, the detonation wave propagates in single wave mode, and the pressure peak is around 2.0MPa. When the area ratio is 0.32, the detonation wave propagates in a single-wave/double-wave coexistence mode, and the peak pressure fluctuation ranges from 0.4 to 3.0 MPa. When the area ratio is 0.08, the detonation wave self-sustaining propagation stability is strong, but the detonation wave stability is weak when the area ratio is too large or too small. Therefore, the area ratio of the annular slot has a great influence on the mixing effect of hydrogen and air, which consequently impacts the detonation stability of the continuous rotating detonation engine.