A method of Frequency Shift Keying(FSK) signals radio identification is proposed aiming at the individual identification of the communication radio, by utilizing the stability of transient carrier frequency of the symbol duration. Features of instantaneous frequency are extracted by using improved multi-cycle“zero crossing”method. The information dimensions of instantaneous frequency are computed. The nearest neighbor classifier is employed to identify the individual communication radio. The simulation results show that the proposed approach is effective in both Gaussian and High Frequency(HF) channels.