The　wax　deposition　experiments　under　cold　and　hot　flow　conditions　were　conducted　in　a　flow　loop　apparatus　using　waxy　crude　oil.　The　wax　precipitation　characteristics　and　wax　molecule　carbon　number　distributions　of　wax　deposit　in　the　radial　were　investigated　emphatically.　The　wax　content　and　wax　appearance　temperature　(WAT)　of　the　surface　deposits　were　lower　than　those　at　bottom.　The　mass　ratio　of　wax　molecules　heavier　than　the　critical　carbon　number　(CCN)　from　high　to　low　was　the　bottom　deposit,　surface　deposit　and　crude　oil,　while　in　the　range　lighter　than　the　CCN,　the　order　was　opposite.　The　CCN　was　C-30　and　the　peak　carbon　numbers　were　C-35　and　C-37　for　the　cold　and　hot　flow　experiments,　respectively.　This　work　deepens　the　understanding　of　the　radial　distribution　characteristics　of　wax　deposit　and　its　intrinsic　mechanism,　affording　a　useful　reference　for　the　formulation　of　pigging　plan.