This　study　examined　the　mediating　role　of　psychological　detachment　from　work　and　the　moderating　influence　of　perceived　organisational　telework　task　support　in　the　relationship　between　the　extent　of　telecommuting　and　the　job　performance　of　employees.　Using　a　time-lag　study　design,　we　collected　data　from　a　sample　of　435　employees　from　several　companies　in　China　during　the　COVID-19　pandemic　(female　=　67.8%;　31-40　years　old　=　51.7%;　mean　telecommuting　hours　=　8.29　hours　per　week;　SD　=　11.86).　Following　the　mediating　analyses,　our　results　showed　psychological　detachment　from　work　significantly　mediated　this　relationship　between　the　extent　of　telecommuting　and　the　job　performance　of　employees,　so　that　employee　job　performance　was　lower.　Furthermore,　perceived　organisational　telework　task　support　did　not　moderate　the　relationship　between　the　extent　of　telecommuting　and　job　performance.　These　findings　suggest　a　need　for　work　managers　to　provide　telecommute　support　as　part　of　work　organisation　COVID-19　mitigation.