Abstract: Adaptive beamformer is one of the core algorithms in hearing aids. In this paper, theoretical research has been made to traditional adaptive GSC beamformer algorithm for the leak of speech existed in this algorithm. A speech processing technology was proposed to compensate the leak of speech. In this technology, amplitude spectrum envelope was modified to improve the similarity between spectrum envelope and the pitch contour with the information of pitch frequency curves so that the intelligibility of speech is improved. Considering that the speech signal has a great loss in the high frequency range, as a characteristic of the leak information, a consonant amplification method has been shown in this paper to raise the energy of voiceless consonant, reduce the noise energy and improve speech intelligibility without changing the formant structure. The simulation results show that this speech processing technology is able to compensate the leak of speech and improve the intelligibility of speech.