Composite　insulators　are　important　components　of　conductors　and　towers.　A　string　break　or　breakdown　occurs　will　have　an　extremely　adverse　impact　on　power　grid　security　and　public　safety.　This　paper　summarizes　the　string　breaking　and　breakdown　failures　of　insulators　in　Fujian　province　in　recent　10　years,　and　the　typical　failures　such　as　brittle　fracture,　decay-like　fracture,　string　break　and　core　breakdown　are　analyzed　experimentally.　The　statistical　results　show　that　in　the　past　10　years,　a　total　of　23　breakdowns　of　insulators　above　110kV　have　occurred　in　Fujian　province,　including　12　cases　of　brittle　fracture　failures,　7　cases　of　decay-like　fracture　failures　and　4　cases　of　core　rod　break-down　failures.　According　to　the　characteristics　of　typical　fault　cases,　it　is　suggested　that　the　core　is　made　of　boron-free　fiber　resistant　acid　core　with　good　stress　corrosion　resistance,　and　the　composite　insulator　ends　are　connected　by　coaxial　multi-directional　crimping.　©　2023　IEEE.