Abstract:60 coke oven workers (F/M=2:1, age: 40~50) from Taiyuan, Shanxi province were recruited and their urine samples were collected before and after 8h work in heating (December 2009) and non-heating season (September 2009), respectively, with 60 farmer as control group. Informations on their age, gender, and others were gathered by a unified questionnaire. Concentration levels of 6OH-PAHs in urine samples were determined by enzymatic hydrolysis-high-performance liquid chromatography. The average concentration of 2-hydroxynaphthalene (2-OHNap), 2-hydroxyfluorene (2-OHFlu), 3-hydryxyphenanthrene (3-OHPhe), 9-hydryxyphenanthrene (9-OHPhe), 1-hydroxypyrene (1-OHPy) and 3-hydroxybenzo(a)pyrene (3-OHBaP) were 19.83, 5.63, 2.05, 1.75, 1.67and 0.23μmol/mol creatinine in coke oven workers. The trend of OH-PAHs concentration level was in order of 2-OHNap> 2-OHFlu> Σ-OHPhe (3-OHPhe +9- OHPhe)> 1-OHPy> 3-OHBap; the levels of men were higher than that of women, and the levels in heating period were higher than that in non-heating period. Concentrations trend of urinary OH-PAHs level was top side workers> side oven workers > bottom side workers>control group, which was adjust for external exposure categories. Concentrations of OH-PAHs after 8hours work were higher than the levels before work, and 3-OHBap had the most greatly increase by 55%. The results show that there was a proportional relationship between urinary concentrations of OH-PAHs and external exposure levels of coke oven workers. Therefore, further research of the relationship between external and internal exposure levels of coke oven workers is recommended.