A　novel　nano-cobalt/ethanol　sol　was　firstly　obtained　by　pulsed　laser　ablation　on　the　interface　of　solid　and　flowing-liquid.　TEM　results　show　that　nano-cobalt　particles＇　size　is　about　30　rim.　Electronic　diffraction　and　XRD　analysis　both　indicate　that　the　nano-cobalt　is　non-crystalline.　It　was　found　that　the　stretching　vibration　of　associating　hydroxyl　(gamma(OH))　and　the　deformation　vibration　of　C-H　in　ethanol　are　strengthened,　but　stretching　vibration　of　gamma(c-o)　in　primary　hydroxyl　of　ethanol　is　restrained　through　the　FTIR　spectrum.　The　UV-Vis　results　show　that　there　are　one　strong　absorption　peak　at　231.　99　nm　due　to　primary　nano-cobalt　particles　and　two　medium　absorption　peaks　at　273.　00　and　308.　56　nm　due　to　quantum　confine　effect.