Hydrate　formation　is　a　major　flow　assurance　issue　for　underwater　multiphase　pipelines.　The　heavy　fractions　in　crude　oil　make　it　more　complicated.　However,　the　impact　of　a　single　fraction　in　oil　on　hydrate　behaviors　is　still　poorly　understood.　In　response,　this　paper　aims　to　investigate　and　compare　the　effects　of　waxes　and　asphaltenes　on　CO2　hydrate　nucleation　and　decomposition,　using　a　self-designed　high-pressure　autoclave.　The　results　show　that　both　waxes　and　asphaltenes　retard　hydrate　nucleation,　wherein　asphaltenes　have　a　more　pronounced　effect　than　waxes.　Waxes　mainly　restrict　gas　diffusion　in　the　bulk　phase　during　hydrate　nucleation.　Asphaltenes　are　more　effectively　adsorbed　on　the　surface　of　the　water　droplet　and　hydrate　nucleus　to　retard　the　nucleation.　In　addition,　the　decomposition　rate　of　hydrate　particles　is　lowered　when　trapped　in　the　wax　gel-like　structure,　whereas　it　is　enhanced　by　the　increased　hydrate　surface　area　with　asphaltenes.　This　work　provides　insights　into　the　effects　of　crude　oil　components　on　the　behaviors　of　hydrate,　which　can　facilitate　flow　assurance　applications　in　subsea　multiphase　pipelines.