The　contamination　of　the　insulators＇　surface　can　affect　the　operation　of　the　high-voltage　line　running　state.　The　detection　of　the　existing　insulator　contamination　relied　on　sampling　in　the　power　cut,　taking　back　to　lab　and　testing　with　element　analysis　equipment.　Laser-induced　breakdown　spectroscopy　(LIBS)　with　inductively　coupled　plasma　spectroscopy　(ICP)　provided　a　new　method　for　determining　the　contamination　level　of　transmission　line　insulators　and　the　quantitative　relationship　between　the　content　of　several　salt　ions　and　the　laser　spectrum　in　artificial　contamination　was　studied.　Results　showed　that　the　LIBS　could　directly　monitor　the　content　of　the　elements　in　contamination.　Mg,　Ca　and　other　elements　concentration　and　spectral　intensity　of　certain　lines　showed　a　strong　linear　relationship,　while　Na　and　Al　had　no　significant　linear　relationship　between　the　soluble　salt　elements　corresponding　to　the　lines.　The　alkali　metal　elements　such　as　Na　was　greatly　affected　by　the　matrix　effect.　The　principal　component　analysis　(PCA)　was　used　to　analyze　the　intensity　and　concentration　of　multiple　elements.　The　result　was　good　for　classifying　different　contamination　components.　©　2019,　Electrical　Technology　Press　Co.　Ltd.　All　right　reserved.