In　order　to　understand　the　failure　modes　and　impacts　of　high　temperature　for　lead-carbon　battery(LCB)　on　positive　electrodes,　we　carried　out　the　electrochemical　tests　to　investigate　the　impacts　of　temperature,　Moreover,　after　analyzing　the　teardown　LCB,　we　employed　characterization　and　analysis　of　X　ray　diffraction,　scanning　electron　microscope　and　energy　disperse　spectroscopy　to　investigate　the　failure　modes　and　mechanisms　on　positive　electrode.　The　result　shows　that,　after　500　cycles,　the　capacity　retention　is　90%　under　the　temperature　of　40,　which　is　much　higher　than　that　of　50　and　60.　The　teardown　analysis　shows　that　the　content　of　α-PbO2　in　the　newly　made　positive　electrode　is　14.55%　and　2　to　β-PbO2　in　positive　active　material　and　positive　grid　corrosion　are　the　two　major　reasons　for　positive　electrode　failure.　And　the　temperature　below　40　does　not　have　much　damage　to　LCB,　the　temperature　over　50　high　temperature　significantly　aggravates　grid　corrosion　and　then　the　positive　electrode　fails.　In　daily　application,　more　attention　should　be　paid　to　the　temperature　control　of　the　battery,　modification　of　positive　active　material　and　positive　grid,and　these　measures　can　suppress　the　failure　modes　effectively.　©　2018,　High　Voltage　Engineering　Editorial　Department　of　CEPRI.　All　right　reserved.