Terahertz　(THz)　radiation　is　able　to　penetrate　many　different　types　of　nonpolar　and　nonmetallic　materials.　THz　imaging　can　be　combined　with　computed　tomography　(CT)　to　form　THz　CT,　which　is　an　effective　method　to　visualize　the　sample＇s　internal　structure.　Here,　we　report　the　continuous-wave　(CW)　THz　CT　imaging　results　using　Bessel　beam　generated　by　use　of　axicon.　In　this　method,　the　sample　cross　section　is　scanned　in　all　translation　and　rotation　directions.　Due　to　the　non-diffracting　property　of　the　Bessel　beam,　two-dimensional　(2-D)　cross-sectional　images　of　the　internal　structure　of　the　plastic　pipe　at　different　distances　from　axicon　can　be　full　reconstructed　by　using　filtered　back　projection　algorithm.　Compared　with　conventional　Gaussian　beam,　Bessel　beam　can　extend　the　depth　of　field　in　CW　THz　CT　system.　Using　this　system,　we　obtained　2-D　cross-sectional　image　of　the　internal　structure　of　the　clogged　plastic　pipe　and　the　obstruction　was　accurately　detected　by　comparing　2-D　cross-sectional　images　at　different　sections.　Our　experimental　data　demonstrated　a　feasible　application　of　the　CW　THz　CT　system　with　Bessel　beam　in　non-destructive　testing.