Abstract: The curvature change model of the hollowed micro-bottle resonator was proposed and the influence of curvature on its transmission characteristics was studied. Firstly, the distribution of the whispering-gallery mode in the micro-bottle resonator was analyzed by the simulation. The restriction to the whispering-gallery mode by the micro-bottle resonator became stronger with the increase of curvature, which resulted in the higher energy of the internal light field. Then, the hollowed micro-bottle resonators with different curvature were fabricated by controlling the discharge times of the fusing splicer. And according to the equation of ideal gas state, the curvature model in the fabrication process was derived and the variation trend of the curvature for hollowed micro-bottle resonator with the discharge times was studied. The experimental results show that the quality factor can be enhanced with the increase of curvature, which can reach to 7.26×10⁵. This conclusion has important value in improving the quality factor of the resonator.