The energy distribution properties of light scattered by bubbles in far ship wakes were studied to study the detection and homing mode of optical wakes. By means of Mie theory, the energy distribution function's expression of bubble populations was derived. Based on this derived formula, the energy distribution functions about clean bubbles and dirty bubbles coated with two mainly organic films were obtained by numerical calculation. The results show that the forward scattering energy of bubbles is far higher than that of backscattering, and occupies above 90% of all scattering energy; the scattering energy within forward 1° expands to beyond 40% rapidly, and then increases slowly with the scattering angle; the organic film coated to bubbles can enhance the bubbles’ backscattering energy significantly, but has little influence on its forward scattering energy.