The dynamic studys of the lattice vibrational behaviors and hyperfine interactions on the Bi-based high-Tc superconductors are conducted by means of M?ssbauer measurement. The recoilless fractors show that there is a significant lattice softening on Cu-O layers, above superconducting temperature, around 120 and 200K respe-ctively. Such anomalous behavior is thought to be a precursor effect of supercondu-ctivity. The recoilless fractors and the isomer shifts show that the Debye tempera-ture ΘD=310-350K. Based on the measurement of isomer shift, quatrupole spli-tting and spectroscopy width. it can be seen that both softening of lattice vibrational modes and delocalization effect on d-electron orbits exsist.