SnS,　a　well-known　van　der　Waals　chalcogenide,　is　susceptible　to　oxidation　in　high-temperature　or　high-humidity　environments,　significantly　impacting　its　functional　performance　and　device　stability.　Conversely,　oxidation　can　be　used　as　an　effective　strategy　for　surface　engineering,　allowing　for　structure　modulation　or　design,　property　tuning　and　application　exploration.　However,　there　is　currently　a　gap　in　understanding　the　relationship　between　the　oxidation　behavior　of　SnS,　the　structure　of　its　oxidized　surface,　and　the　dependence　on　oxidation　temperature.　In　this　study,　we　systematically　investigated　the　evolution　of　SnS　surfaces　under　thermal　oxidation　using　electron　microscopy.　The　microstructure　evolution　(e.g.,　surface　structures,　phases,　defects,　and　interface)　of　SnS　during　high-temperature　oxidation　has　been　fully　characterized　and　studied　based　on　cross-sectional　samples.　Various　surface　heterostructures　were　constructed,　including　SnO2/SnS,　SnO2/SnS2/SnS,　and　SnO2/Sn2S3/SnS,　offering　significant　potential　for　the　surface　functionalization　of　SnS-based　systems.　Accordingly,　oxidation　mechanisms　at　different　stages　were　elucidated　based　on　the　detailed　and　clear　picture　of　microstructures.　This　research　not　only　deepens　our　understanding　of　the　fundamental　science　of　SnS　oxidation　but　also　provides　valuable　insights　for　preventing　and　developing　surface　oxidation　engineering　in　SnS　and　other　van　der　Waals　chalcogenides/materials.　SnS　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic),　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic),　(sic)(sic)(sic)SnS　(sic)(sic)(sic)(sic)(sic),(sic)(sic)(sic)　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic),　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)SnS　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)((sic)(sic)(sic),(sic)(sic)(sic)(sic)(sic)(sic))(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)SnO2/SnS,　SnO2/SnS2/SnS　(sic)SnO2/Sn2S3/SnS　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),　(sic)SnS　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic),　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),　(sic)(sic)(sic)SnS　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)SnS　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic),　(sic)(sic)(sic)SnS　(sic)(sic)　(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)/(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic).