Objective To investigate the application of speech spectrum analysis to functional speech disorder. Methods 60 patients with simple functional speech disorders from the hospital from December 2018 to December 2019 were selected as the experimental group; At the same time

60 healthy volunteers without speech disorders were recruited as the control group. In a quiet speech room

the speech signals of the two groups of subjects were sampled by the computer. Speech Analyzer software was used to analyze the speech files of each subject

and the differences in the occurrence rates of plosives

affricate release burst and fricative random were compared between different groups. Dr Speech Science for Windows was used to analyze the acoustic parameters of sound samples in the two groups: Jitter

Shimmer

and normal noise energy（NNE）. After the preliminary analysis of the speech spectrum of patients with functional speech disorder

targeted speech training was conducted. After the training

Speech Analyzer software was used to objectively evaluate the speech therapy

and the speech intelligibility of patients in the experimental group was evaluated subjectively according to the "Speech Intelligibility Word Table". Results Compared with the control group

the release burst and blank space of/pa//ka/sound appeared in the verbal map of the experimental group

but the release burst and fricative random of affricate/zi//ji/were not obvious. There was no significant difference in the acoustic index of the plosives and affricate between the experimental group and the control group（P>0.05）

but there was a significant difference in the affricate/zi//ji/（P<0.05）. Shimmer and NNE of the experimental group were significantly higher than those of the control group（P<0.05）

and there was no significant difference in the jitter value between the two groups（P>0.05）. After targeted speech therapy

the speech intelligibility of the experimental group was significantly improved（P<0.05）. Conclusion The speech spectrum analysis can visualize the sound and intuitively display the speech characteristics of the sound. After targeted speech therapy

the speech intelligibility of the patients in the experimental group has significantly improved

providing a reliable scientific basis for speech correction training and evaluation of speech correction effect in patients with functional speech disorder.