A strategy was proposed to improve the performance of continuous interleaved sampling algorithm by introducing partial temporal fine structure cues,namely frequency modulation （FM） information,into the slowly varying temporal envelops.The improved algorithm has its own application values because it does not introduce too much high-frequency components into the model,which can not be perceived by deaf patients.The psychoacoustic experimental data showed that the introduction of the frequency modulation information can improve the CI performance greatly：the intelligibility of vowel perception can get over 28%improvements, tone recognition scores can increase more than 20%at various noise conditions,and under moderate noise conditions the consonant and sentence recognition can also be improved 22.9% and 28.3%respectively.
