The study of epidemiological characteristics of 411 patients suffering contact dermatitis due to cement, the author showed that: - In the cement-using group, the ages of 20-39 was the highest in the ratio. In cement-producing group, the agps of 40-49 was the highest. - Men amounted to 88.81 percent, and women 11.19 percent. - The ratio of contact dermatitis increased when working period contacting cement expandea. - The ratio of contact dermatitis in the cement-using group was higher than in the cement-producing group. - Allergic contact dermatitis took up 66.15 percent, irritant contact dermatitis 26.92 percent, and chronic prurigo papulars 6.93 percent.