Slip & fall incidences are causes for major occupational safety & health events globally. This research investigated coefficients of friction (COF) of floors and workers’ experiences of slip & fall in 24 stands at two traditional and two fish markets. The measurements of COF of floors were conducted by using the Brungraber Mark II device on 8 spots in each of the stands. The results showed that the traditional markets had significant higher floor friction than those in the fish markets. Comparing the selling product, the fish stands had significant the lowest COF, next was the chicken stands, then the vegetable stands, the next pork stands, and finally the dry stuff stands. This order reflects the risk of slip & fall from high to low. Workers’ interview results showed the percentage of workers with slip & fall experience in the fish markets was 2.37 times than that of the traditional markets. The percentage of workers with experience of witness slip & fall of others in the fish markets was 1.78 times than that of the traditional markets. This was consistent with the findings in the COF measurements. It also coincides with our expectation in the market floor environments.