Objective To understand the quality of suspected occupational diseases online reports in Ningxia Hui Autonomous Region (Ningxia),to identify the risk points of report quality and provide a basis for improving the quality of online reports. Methods A stratified proportional sampling method was used to select 38 occupational health examination institutions from 5 cities in Ningxia,and a survey of delayed reporting and missed reporting was conducted on their suspected occupational diseases reported online from January 1,2018 to December 31,2022.A database was established by using Excel 2019,and statistical analysis was conducted by using SPSS 22.0. Results From 2018 to 2022,38 occupational health examination institutions in Ningxia reported a total of 880 suspected cases of occupational diseases.There were 318 cases of late reporting,with a late reporting rate of 36.14%.There were 30 cases of underreporting,with an underreporting rate of 3.30%.The delayed reporting rates from 2018 to 2022 were 2.60% (5/192),25.83% (31/120),73.12% (68/93),34.95% (72/206) and 52.79% (142/269),respectively,showed an upward trend (χ${}_{trend}^{2}$=41.966,P<0.001).The underreporting rates from 2018 to 2022 were 2.54% (5/192),3.23% (4/120),3.13% (3/93),1.90% (4/206) and 4.95% (14/269),with no statistically significant difference (P_Fisher=0.395).The regional distribution was mainly dominated by Yinchuan and Shizuishan,accounting for 49.09% (432/880) and 32.61% (287/880),the delayed reporting rates were 37.73% (163/432) and 37.63% (108/287),and the missed reporting rates were 2.48% (11/432) and 3.37% (10/287),respectively.The distribution of reporting institutions was mainly composed of public institutions and private institutions,accounting for 73.18% (644/880) and 26.59% (234/880),the delayed reporting rates were 41.15% (265/644) and 22.65% (53/234).The underreporting was mainly found in enterprise hospitals and private institutions,with underreporting rates of 100.00% (2/2) and 6.77% (17/234).The suspected occupational diseases were mainly occupational pneumoconiosis and occupational ear,nose,throat,and oral diseases,accounting for 59.55% (524/880) and 32.05% (282/880),respectively,the delayed reporting rates were 27.48% (144/524) and 54.96% (155/282),and the missed reporting rates were 3.50% (19/524) and 1.74% (5/282),respectively.The inconsistency rate of chest X-ray conclusions among workers exposed to dust was 23.79% (285/1 198),and the inconsistency rate of physical examination conclusions was 28.21% (338/1 198).The inconsistency rate of hearing results among workers exposed to noise was 10.78% (143/1 327),and the inconsistency rate of physical examination conclusions was 50.49% (670/1 327). Conclusion The delayed and underreporting rates of suspected occupational diseases reports in Ningxia are relatively high.It is necessary to accelerate the construction of provincial-level information platforms,strengthen the supervision of occupational diseases health examination institutions,stabilize the team of occupational diseases network reporting personnel,and improve the quality of network reporting of suspected occupational diseases.