This study was conducted to evaluate the health risk of workers exposed to phenyl glycidyl ether to prevent them from developing occupational diseases. The workplaces that coat floor with epoxy were selected and the samples were collected and analyzed with NIOSH 1619 Method. Unit risk was calculated according to the animal carcinogenicity study. Excess cancer risk was also calculated by multiplying unit risk by exposure concentration. Monte Carlo simulation was performed to calculate the median, cumulative 90%, and cumulative 95% value. Phenyl glycidyl ether is a skin, eye irritator and can result in allergic reaction, nausea, intoxication. Unit risk was calculated as 0.04 (mg/m3)-1 based on the tumor incidence in rats. Geometric mean and geometric standard deviation was also calculated as 0.112 ppm and 0.223, respectively by the workplace environment measurements. The median, cumulative 90%, and cumulative 95% value of excess cancer risk were calculated as 0.0244, 0.1328, 0.1596, respectively. Not only cumulative 90% and cumulative 95% value but also the median of excess cancer risk is much higher than 1×10-4 by the risk characterization, so there is a possibility of carcinogenesis to workers. Therefore, supervisors or managers of each workplace have to keep doing the risk management of their workplaces for workers to reduce exposure to phenyl glycidyl ether. Keywords : Excess cancer risk, Monte Carlo simulation, Phenyl glycidyl ether, Risk assessment, Unit risk