Coke　making　is　extremely　problematic　from　the　environment　and　health　perspectives,　as　the　massive　hazardous　volatile　organic　compounds　(HVOCs)　being　driven　off　during　the　coking　process.　Here,　we　conducted　a　health　risk　assessment　study　on　coking　workers,　through　on-situ　HVOCs　measurements　and　questionnaire　investigation　on　activity　time　parameters　and　protection　measures.　The　ambient　HVOCs　at　major　working　stations　were　58.4-376.5　mu　g/m3　with　relative　deviation　of　59.4%　for　the　certain　station.　The　total　working　hours　during　career　would　reach　43283-51695　h,　and　protection　efficiency　(PE)　to　resist　HVOCs　inhalation　ranged　from　16%　to　87%.　According　to　the　exposure　evaluation　model　recommended　by　the　U.S.　EPA,　there　was　little　non-cancer　risk　for　the　workers　at　most　positions　with　hazard　quotient　(HQ)　value　of　less　than　1;　however,　the　cancer　risk　widely　existed　with　lifetime　cancer　risk　(LCR)　value　of　3.6-15.0　x　10-6,　in　which　benzene,　1,2-dichloropropane,　1,2-dichloroethane,　and　1,3-butadiene　were　dominant　inducers.　The　cancer　risk　regarding　the　large　plants　was　about　28.6%　lower　compared　to　the　small　and　medium　plants,　due　to　the　greater　PE.　In　terms　of　the　response　of　the　health　risk　to　exposure　duration　(ED,　working　years)　and　PE,　non-cancer　risk　effectively　responded　only　for　the　byproduct　recovery　stations,　while　cancer　risk　more　sensitively　responded　for　all　stations.　Health　risk　manage-ment　therefore　is　essential,　and　the　potential　health　hazards　can　be　avoided　by　limiting　ED　and　strengthening　PE.　For　workers　in　coking,　byproduct　recovery　and　office　areas,　the　PE　should　be　higher　than　93.8%,　97.7%　and　77.3%　under　the　ED　of　20　years,　the　ED　in　three　areas　should　be　lower　than　12.5　years,　4.5　years　and　30　years　under　PE　of　90%,　respectively.