The pulsation of bubbles generated by underwater wire exploding is studied by means of high-speed photography. We discovered that mechanical parameters of the b ubbles are mainly determined by the total discharge energy and related not much to the voltage and the capacitance. Boundary influence is also not too large in the experiment. The energy of pulsation occupies 20%—40% of the total discharg e energy, and the proportion between the pulsation energies of the first time an d the second time is about this value. The bursting forth phenomenon is the main reason of the decline of bubble's energy.