The three branches of phonetics, pronunciative phonetics, acoustic phonetics and auditory phonetics, correspond to the three important links of the speech chain of spoken language: the generation, transmission and perception of speech, which together constitute the perception chain and self-perception feedback chain of both sides of communication. All links in the speech chain need to be interconnected and work together to ensure smooth verbal communication. However, for patients with severe or very severe hearing impairment, due to the lesion or injury of the hearing organ, it is impossible to form a complete speech interaction circuit, which restricts the normal development of their language ability and affects their socialization process. This issue of Journal of Chinese Chinese and Sound specially edited the review and research results of speech processing disorders in hearing-impaired children, and concentrated 6 case studies on atypical speech characteristics and interventions in hearing-impaired children, hoping that more colleagues can participate in relevant research, so as to further reveal the speech processing mechanism of people with Chinese language impairment and realize the effective assessment and intervention of speech disorders. In addition, this issue also presents a variety of research on the speech communication of "mask mode" under the new situation of epidemic prevention, and the output and perception characteristics of the voice and super-voice of hearing speakers and second language learners. Phonetics is a relatively independent and highly intersectional discipline, involving a wide range of research areas. Chinese speech and hearing science needs to be cross-integrated with phonetics, audiology, rehabilitation medicine, computational linguistics and other disciplines to deeply investigate the discourse characteristics of Chinese people with speech disorders. Phonetics should also give full play to its own disciplinary advantages, gradually open a new horizon of research from small prosody unit to large prosody unit, and gradually improve the systematic description of Chinese speech disorder from syllabic characteristics to super-phonic characteristics, so as to provide a new research paradigm and theoretical basis for Chinese speech and hearing rehabilitation.（AI翻译）