A　neutral,　nonpolar　monolithic　capillary　column　was　evaluated　as　a　hydrophobic　stationary　phase　in　pressurized　CEC　system　for　neutral,　acidic　and　basic　solutes.　The　monolith　was　prepared　by　in　situ　copolymerization　of　octadecyl　methacrylate　and　ethylene　dimethacrylate　in　a　binary　porogenic　solvent　consisting　of　cyclohexano1/1,4-butanediol.　EOF　in　this　hydrophobic　monolithic　column　was　poor;　even　the　pH　value　of　the　mobile　phase　was　high.　Because　of　the　absence　of　fixed　charges,　the　monolithic　capillary　column　was　free　of　electrostatic　interactions　with　charged　solutes.　Separations　of　neutral　solutes　were　based　on　the　hydrophobic　mechanism　with　the　pressure　as　the　driving　force.　The　acidic　and　basic　solutes　were　separated　under　pressurized　CEC　mode　with　the　pressure　and　electrophoretic　mobility　as　the　driving　force.　The　separation　selectivity　of　charged　solutes　were　based　on　their　differences　in　electrophoretic　mobility　and　hydrophobic　interaction　with　the　stationary　phase,　and　no　obvious　peak　tailing　for　basic　analytes　was　observed.　Effects　of　the　mobile　phase　compositions　on　the　retention　of　acidic　compounds　were　also　investigated.　Under　optimized　conditions,　high　plate　counts　reaching　82　000　plates/m　for　neutral　compounds,　134　000　plates/m　for　acid　compounds　and　150　000　plates/m　for　basic　compounds　were　readily　obtained.