Energy　conservation　and　emission　reduction　in　campus　building　are　key　issues　as　the　area　of　campus　buildings　and　per　capita　energy　consumption　rise.　Hence,　from　2021　to　2022,　this　study　conducted　a　year-long　field　survey　at　a　university　in　Beijing,　China,　focusing　on　seven　graduate　research　offices　with　varying　occupancy　rates.　The　indoor　thermal　environment　and　air　conditioning　(AC)　usage　patterns　in　graduate　research　offices　were　statistically　analyzed.　And　an　adaptive　thermal　comfort　model　applicable　to　graduate　research　offices　in　Beijing　area　was　established.　The　results　show　that　students　typically　adjust　to　the　environment　by　modifying　their　clothing　and　utilizing　AC,　with　the　act　of　opening　windows　being　infrequent.　There　is　excessive　use　of　AC　by　students.　90　%　of　ACs　are　turned　on　for　supplemental　heating　at　17.6　°C　and　supplemental　cooling　at　28.0　°C.　And　90　%　of　air　conditioners　are　turned　off　when　the　indoor　air　temperature　rises　to　26.0　°C　during　heating　period　or　drops　to　25.7　°C　during　cooling　period.　However,　the　neutral　temperature　is　21.9　°C　in　heating　period　and　26.8　°C　in　cooling　period,　the　thermal　preferred　temperature　is　24.0　°C　in　heating　period　and　25.4　°C　in　cooling　period.　More　than　80　%　of　subjects　voted　comfortable　when　the　temperature　ranges　between　18.2　∼　26.7　°C　in　heating　period　and　25.2　∼　28.0　°C　in　cooling　period.　This　study　serves　as　a　crucial　reference　point　for　future　research　on　heating,　ventilation　and　air　conditioning　in　graduate　student　offices　and　for　promoting　energy　conservation　and　emission　reduction　across　university　campuses.　©　2024　Elsevier　B.V.