ABSTRACT Coronavirus infection was confirmed in 64,329 people in Makassar with 1,106 people dying and 63,147 recovering. Makassar, Daya's traditional market, is one of the top four markets with a high risk of COVID-19 transmission. This traditional market has 82 active shop houses, 42 shops, 67 kiosks, 100 lodz, and 232 street vendors, with an estimated annual visitor population of 23,182-27,639 people, ranking fourth among the twenty largest traditional markets in Makassar, behind Sentral Market, Terong Market, and Toddopuli Market. The study's goal is to gather detailed information about traders' knowledge of COVID-19 symptoms and characteristics, how COVID-19 spreads, how COVID-19 is transmitted from people who do not show symptoms, the definition of contact with someone infected with COVID-19, how to prevent COVID-19, why COVID-19 affects health behavior, how self-isolation works, and what to do if someone is infected with the virus in 2021-2022. The research employs a qualitative/ethnographic approach. Data analysis is aided by Spradley, Miles, and Huberman techniques. The findings revealed that traders' knowledge of COVID-19 symptoms is limited to understanding heat and fever symptoms; COVID-19 can only be transmitted from infected people; and the effect of COVID-19 on health behavior occurs when the trader's body weakens, falls ill, and becomes unable to trade. Finally, traders' knowledge ranges from C1 to C4. Keywords: Covid prevention, trader knowledge, traditional market