Carbon　nanotubes　(CNTs)　can　be　incorporated　into　polymer　matrices　to　form　CNTs/polymer　composites　exhibiting　outstanding　mechanical,　electrical　and　nonlinear　optical　properties.　The　crystallization　and　morphology　of　the　polymers　can　be　strongly　affected　by　small　additions　of　CNTs.　A　large　number　of　research　results　have　demonstrated　that　these　composite　materials　have　found　many　potential　applications　in　the　fields　of　e.g.　photovoltaic　cells,　organic　light-emitting　device,　optical　limiting,　all-optical　switches,　protective　coatings,　and　artificial　muscles　as　well.　This　review　introduced　the　preparation　of　CNTs/polymer　composites,　and　their　potential　applications　in　many　high-technology　fields.