With　the　development　of　national　economy　and　the　continuous　improvement　of　people＇s　living　standard,　the　diversification　and　specialization　of　polystyrene　(PS)　products　have　become　the　development　trend　of　market　competition　and　consumers＇　requirements.　As　an　important　modification　method　to　improve　the　properties　of　PS　special　materials,　catalytic　hydrogenation　process　has　become　a　research　hotspot　in　the　field　of　chemical　modification　of　unsaturated　polymers　in　recent　years.　Herein,　the　improvement　of　hydrogenation　process,　the　design　and　optimization　of　hydrogenation　catalysts　and　the　new　progress　of　reaction　mechanism　in　the　preparation　of　polycyclohexylethylene　(PCHE)　through　PS　heterogeneous　catalytic　hydrogenation　were　reviewed.　The　influence　of　the　structure　design,　physical　and　chemical　properties　of　the　hydrogenation　catalyst　and　mass　transfer　diffusion　resistance　on　the　process　of　PS　hydrogenation　catalyst　activity　was　elaborated.　The　＇Blocky＇　mechanism　of　PS　hydrogenation　was　discussed　in　the　heterogeneous　catalytic　hydrogenation　system.　It　is　suggested　that　the　future　research　of　PS　hydrogenation　catalysts　should　be　focused　on　the　structure　design　of　catalysts　to　ensure　high　accessibility　of　the　active　sites　for　polymer　molecules　and　optimize　the　balance　between　the　mass　transfer　diffusion　in　the　hydrogenation　system　and　dispersity　of　active　sites　on　the　catalyst　carrier.　At　the　same　time,　in　order　to　further　improve　the　comprehensive　performance　of　hydrogenation　catalysts,　more　efforts　should　be　devoted　to　the　fundamental　research　on　the　hydrogenation　mechanism　of　polymers　and　synthesis/modification　technology　of　catalysts.　©　2021,　Editorial　Board　of　Polymer　Materials　Science　&　Engineering.　All　right　reserved.