Abstract: For induction accelerating cavity, there are two pulse power feed-in methods: the axial method and the radial method. The effects of different pulse power feed-in methods on the flat-top voltage width of induction accelerating cavities were analyzed and some experiments were carried out to prove this analysis. In the experiments, one Blumlein PFL was used to feed-in “axial” cavity and “radial” cavity at the same time, and a 62 ns width was obtained in the “axial” cavity and a 61 ns width in the “radial” cavity for ±1% voltage flat-top. In additional, the two cavities’ transverse impedances were calculated, and the result showed that the “axial” cavity had lower transverse impedance than the “radial” cavity.