Objective To explore the hearing and cochlear histomorphological changes in APP / PS1 transgenic mice during the process of AD and to determine whether the occurrence and development of AD affect their hearing function. Methods APP / PS1 transgenic mice and wild type littermates were selected at the ages of 4, 8 and 12 months.Changes to the auditory function of APP / PS1 transgenic mice over time were detected by immunofluorescence staining and auditory brainstem response (ABR) test. Results Compared with the control group, the 4-month-old APP / PS1 transgenic mice had a significantly increased number of Aβ plaques in the hippocampus, indicating that AD symptoms were already present at this time. At the ages of 4, 8 and 12 months, there was no significant difference in the hearing threshold between APP / PS1 transgenic mice and wild type mice. Histomorphological examination of the cochlea showed no significant difference in key cells of the inner ear, such as cochlear hair cells and spiral ganglion, between the two groups of mice. An ABR test showed that the hearing threshold of both APP / PS1 transgenic mice and wild type littermates increased significantly with age, and both groups showed age-related hearing loss. Conclusions There was age-related hearing loss in APP / PS1 transgenic mice, but the occurrence and development of AD had little effect on their auditory functions.