In order to understand the time series variation trend,seasonal distribution and personnel health risk of black carbon aerosol in the southern suburb of Shijiazhuang city, the monitoring data of black carbon aerosol from August 2018 to April 2021 were analyzed by using the PivotTable method and health risk assessment model. The results showed that the average concentration of BC in PM2.5 was 3.03 μg/m3. The average concentration of BC in PM2.5 in spring,summer, autumn and winter was 2.12, 1.76, 3.24 and 4.45 μg/m3, respectively. The diurnal variation in spring, summer and autumn was bimodal and single valley, while in winter it was bimodal and double valley. The cancer risks (CR) of adults and children were higher than the acceptable risk level (10-6) given by the EPA. The orders of CR value and hazard quotient (HQ) value before and after the outbreak of COVID-19 were both extremely heavy physical activity>heavy physical activity > medium physical activity > slight activity. However, the HQ of extremely heavy physical activity did not reach the threshold value,indicating that the non-carcinogenic effect of BC during extremely heavy physical activity was not significant.