For the ultra high frequency (adjacent Nyquist frequency) signals that exist in vibration engineering and fault diagnosis domain, traditional discrete spectrum correction methods are not to be adapted to them exactly because of the serious interference caused by the negative frequency components. In order to reduce the influence, a discrete spectrum correction model with both positive and negative frequency component contribution is established for ultra high frequency signals by three frequency lines closing to the peak value according to the spectrum periodicity. The frequency, amplitude and phase correction formula is deduced based on the Blackman window. Simulated gradually increasing real sine signals are adapted to assessment the formulas. Simulation results show that the proposed method is expected to reduce the interference effectively, and can achieve higher accuracy correction results of spectrum parameters for ultra high frequency.