Objective: To analyze the epidemiological characteristics and subsequent diagnosis of suspected occupational noise-induced deafness cases in Nanjing, and to provide reference for medical institutions to report suspected occupational noise-induced deafness, as well as for administrative departments to formulate prevention and control measures, supervision and law enforcement. Methods: The suspected cases of occupational noise-induced deafness reported in Nanjing from 2015 to 2022 were collected by the Chinese Disease Prevention and Control Information System as the research objects, and the suspected cases and subsequent diagnosis were statistically analyzed by comparing the reported cases in the Occupational Disease Report Card on 2015-01-01/2023-03-31. Results: From 2015 to 2022, 266 cases suspected occupational noise-induced deafness were reported in Nanjing, which showed an increasing trend year by year. Most cases were male(93.98%);The incidence was higher in the age group of 41-50 years and the population with the age of exposure ≤15 years, accounting for 39.47% and 70.68%, respectively;The suspected cases were mainly from occupational health institutions(90.98%) and public institutions(51.88%).The diagnosis application rate of suspected cases was 27.82%, and the difference between different years was statistically significant(P<0.05). There were statistically significant differences in the average age of onset and diagnosis rate among enterprises of different economic types(P<0.05); There were statistically significant differences in the average age of onset, diagnosis application rate and diagnosis rate among enterprises of different sizes(P<0.05);There were significant differences in average age of onset and diagnosis application rate among different industries(P<0.05). Regression analysis showed that the size of the enterprises and the nature of the occupational health inspection institutions were independent factors affecting the further diagnosis of suspected occupational noise-induced deafness. The undiagnosed rate of suspected occupational noise-induced deafness in small, micro and large enterprises was higher than that in medium-sized enterprises(OR was 2.739, 2.655, 95%CI 1.278-5.868, 1.197-5.887,P<0.05).The undiagnosed rate reported by private occupational health inspection institutions was higher than that reported by public occupational health inspection institutions(OR=2.066, 95%CI 1.062-4.019,P<0.05).Conclusion: The cases of suspected occupational diseases in Nanjing are mainly suspected occupational noise-induced deafness, and the incidence is affected by gender, age, age of exposure, classification of industry, enterprises scale, economic type factors. The diagnosis application rate and diagnosis rate of suspected cases are both low. The size of enterprise and the nature of reporting occupational health inspection institutions are independent factors affecting the further diagnosis of suspected occupational noise-induced deafness. It is suggested to strengthen the publicity of the Law of the People's Republic of China on the Prevention and Treatment of Occupational Diseases, and make clear the main responsibility of employers. Timely arrange the diagnosis of occupational diseases for suspected cases of occupational diseases; Improve the technical service level of occupational health inspection institutions to accurately screen suspected occupational diseases; The competent authorities need to further strengthen the supervision of key groups and key industries.