In 2019, a total of 15 056 cases of medication error (ME) from 234 hospitals in 24 provincial administrative regions were collected in the National Monitoring Network for Clinical Safe Medication. The number of hospitals reporting ME increased by 32.20% compared with that in 2018 (177 hospitals), and the number of reported cases increased by 28.02% compared with that in 2018 (11 761 cases). In 15 056 cases of ME reports, 52 (0.35%) were classified as grade A, 11 175 (74.22%) as grade B, 3 351 (22.26%) as grade C, 350 (2.32%) as grade D, 79 (0.52%) as grade E, 44 (0.29%) as grade F, 0 as grade G, 4 (0.03%) as grade H, and 1 (0.01%) as grade I. Among the 15 004 patients involved in ME of grade B‑I, 8 801 (58.66%)were male and 6 203 (41.34%) were female; the age of these patients ranged from 1 day to 103 years, 2 027 patients (13.51%) were <18 years old, 7 377 patients (49.17%) were ≥18 to <60 years old, and 5 600 patients (37.32%) were ≥60 years old. Serious MEs (grade E‑I) involved 128 patients, of whom 65 (50.78%) were aged over 60 years. The top 3 drugs involved in serious MEs were insulin glargine, methotrexate tablets, and warfarin tablets. The 52 cases of grade A MEs did not involve person who triggered the MEs and places where MEs occurred. In the 15 004 cases of grade B‑I MEs, 9 821 (65.46%) were triggered by physicians, 3 561 (23.73%) by pharmacists, 634 (4.23%) by nurses, 306 (2.04%) by patients and their family members, and 2.04% (4.54%) by other persons; the proportion of MEs triggered by physicians and patients and their family members were higher than those in 2018 (60.89% and 1.06%), respectively; 5 662 (37.74%) occurred in the clinics, 4 001 (26.67%) in hospital wards, 3 721 (24.80%) in the pharmacies, 1 084 (7.22%) in pharmacy intravenous admixture services, 224 (1.49%) in the nurse stations, 133 (0.89%) in patients′ houses, 4 (0.03%) in the community health service stations, and 175 (1.17%) in other places; the proportion of MEs in pharmacy intravenous admixture services and patients′ houses were higher than those in 2018 (5.52% and 0.41%), respectively. The top 3 contents of MEs were wrong drug class, wrong usage, and wrong single dose. The top 3 persons who discovered the MEs were pharmacists, nurses, and physicians. The top 3 factors cau- sing MEs were lack of related pharmacologic knowledge, tiredness, and insufficient training of medical workers.