Abstract: By detecting SF₆ decomposition components,the operating state of the equipment can be effectively evaluated,and the safe and stable operation of the equipment can be guaranteed.Based on the first principles,Pt-HfSe₂ is proposed to detect SO₂ and SOF₂,and the adsorption and sensing mechanism of PT-HFSE₂ on the two gas components is studied,so as to explore its application potential as a resistive gas sensor to evaluate the operating status of SF₆electrical equipment.The results show that the adsorption performance of Pt-HfSe₂on SO₂ is stronger than that of SOF₂,and the two gases have better desorption performance on the surface of PtHfSe₂,which can ensure the reuse of the sensor material.Pt-HfSe₂ has the conditions to be developed as new SO₂and SOF₂ gas sensors,which can be used to evaluate the operating status of SF₆ electrical equipment,providing theoretical support for the research of HFSE₂-based gas sensors,and providing a new idea for the application of new nano-sensor components to the fault diagnosis of power equipment.