Pour　point　depressant　(PPD)　is　widely　used　for　wax　prevention　in　crude　oil　production　and　transportation.　This　paper　aims　to　investigate　the　compositional　and　rheological　properties　of　wax　deposits　formed　from　crude　oils　with　and　without　PPDs.　To　this　end,　an　in-house　cylindrical　Taylor-Couette　cold　finger　device　was　constructed　to　conduct　wax　deposition　experiments.　Tests　on　wax　deposits　show　that　wax　deposit　properties　are　dramatically　changed　by　addition　of　PPDs.　It　was　observed　that　PPDs　lower　wax　deposition　rate　and　increase　wax　appearance　temperature　(WAT)　and　wax　content　of　the　deposits.　Moreover,　the　enriched　heavy　components　of　n-alkanes　and　the　diluted　light　ones　indicate　an　accelerated　aging　process　caused　by　PPDs,　and　the　critical　carbon　number　(CCN)　and　average　carbon　number　of　the　deposits　accordingly　increase.　The　contents　of　asphaltenes　and　resins　entrained　in　wax　deposits　get　lowered　when　PPD　was　added　into　the　crude　oil.　In　addition,　PPDs　would　weaken　the　mechanical　strength　of　wax　deposits,　thus　the　wax　resistive　force　decreases　and　therefore　the　risk　of　pig　stalling　accordingly　gets　lowered.　Above　all,　among　the　evaluated　PPDs,　NPPD　(which　contains　nanocomposites)　presents　the　best　wax　inhibition　performance.　©　2021　Elsevier　B.V.