Based on Jahn-Teller effect theory,quantum theory and group theory,the phonon splitting and anisotropic phenomena of the E(?)e system for B_2H_6 molecules with D_(3h) symmetry are studied in the C_(2v)minima.The vibration frequency of the system after Jahn-Teller distortion is calculated using the unitary shift transformation and modified scale transformation,it is found that the doubly degenerate vibration state e is split into two states and its degeneration is completely lifted because of Jahn-Teller dis...