Because propagation mechanism of borehole acoustic field with Ⅱ interface channeling was unclear and lacked of effective Ⅱ interface cementing quality evaluation methods. Use real-axis integration method to simulate the full wave curve, the two-dimensional spectra and dispersion curves of borehole acoustic field with Ⅱ interface channeling. Extract Ⅱ interface characteristic wave and analyze the influence factors to Ⅱ interface characteristic wave which included channeling fluid ring thickness、local oscillator frequency and tube size etc.. The results show: When the fluid ring thickness was relatively small, the first wave amplitude of Ⅱ interface characteristic wave decreased with increasing thickness; On the contrary, the first wave amplitude increased with the thickness; the first wave travel time analogously decreased with increasing thickness. Use characteristic wave amplitude to calculate the Cement Bond Index, and can eliminate the effects of local oscillator frequency and tube size. Account that characteristic wave mainly spread in steel casing and cement. And discovery by comparison that the most important factor of the characteristic wave amplitude and travel time was cement thickness instead of channeling the fluid ring thickness.