Objective To describe the serological surveillance results of human brucellosis in Ganzhou City， Jiangxi Province from 2018 to 2021， characterize the epidemic and current situation of brucellosis， and to provide scientific evidence for effective prevention and control of brucellosis.

Methods Surveillance data of human brucellosis serological testing was collected in Ganzhou City from 2018 to 2021. Spatial， temporal， and demographic distribution was further determined.

Results From 2018 to 2021， a total of 42 humans serologically positive for brucellosis were reported from 18 counties （cities and districts） in Ganzhou City， including 26 males and 16 females with a gender ratio of 1.6∶1. The number of serologically positive cases showed a decreasing trend， with the positive rate decreasing from 46.43% in 2018 to 33.33% in 2021. Majority of the cases （54.00%） aged 40‒ years old. Furthermore， the number of serologically positive cases varied by month； majority of the cases （80.95%） was from April to August. Additionally， a total of 10 counties （cities and districts） reported serologically positive cases of brucellosis， among which the top 3 counties （cities and districts） by cumulative number of positive cases were Zhanggong District （18 cases）， Dayu County（5 cases）， and Longnan City（4 cases）.

Conclusion Serologically positive cases of human brucellosis decrease in Ganzhou， in which the incidence of male cases is generally higher than female cases. The seasonality of human brucellosis is in spring and summer. At-risk population is 40‒ years old. Additionally， at-risk areas are southwest and central areas of Ganzhou.