In-situ　scanning　electron　microscope　(SEM)　is　essential　for　investigating　materials＇　properties.　In　this　study,　a　custom-built　in-situ　heating　system　was　developed　to　improve　SEM　imaging　at　elevated　temperatures.　A　heater　equipped　with　a　double　helical　tungsten　filament　was　specifically　designed　to　achieve　unprecedented　high　temperatures　for　heating　materials.　A　bias-voltage　control　system　was　proposed　to　suppress　thermal　electrons　during　heating.　Additionally,　a　high-temperature　secondary-electron　detector　was　developed　and　equipped　with　a　variable　visible-light　filter　to　mitigate　the　impact　of　visible　and　infrared　light　at　high　temperatures.　The　heater　and　detector　worked　within　a　high　vacuum　environment　with　a　pressure　level　below　1×10−3　Pa.　Two　in-situ　heating　experiments　were　conducted　using　the　heating　system　to　observe　the　melting　and　crystallizing　processes　of　cobalt　and　the　phase　transformation　of　carbon　steel.　The　results　exhibited　the　remarkable　capability　of　the　heating　system　to　image　at　temperatures　as　high　as　1500　°C,　offering　a　resolution　of　40　nm.　This　heater　is　anticipated　to　advance　materials　characterization,　providing　comprehensive　insights　into　their　behavior　at　high　temperatures　and　opening　new　avenues　for　developing　material　properties.　©　2023　Elsevier　Ltd