IntroductionSince　the　outbreak　of　the　COVID-19　pandemic,　the　Chinese　government　has　implemented　a　series　of　strict　prevention　and　control　policies　to　prevent　the　spread　of　the　virus.　Recently,　the　Chinese　government　suddenly　changed　its　approach　and　lifted　all　prevention　and　control　measures.　This　sudden　change　in　policy　is　expected　to　lead　to　a　widespread　outbreak　of　COVID-19　in　China,　and　the　public　and　local　governments　are　not　adequately　prepared　for　the　unknown　impact　on　society.　The　change　in　the　＂emergency＂　prevention　and　control　policy　provides　a　unique　research　perspective　for　this　study.　MethodsThe　purpose　of　this　study　is　to　analyze　the　public＇s　attitudes　and　emotional　responses　to　COVID-19　under　the　sudden　opening　policy,　identify　the　key　factors　that　contribute　to　these　attitudes　and　emotions,　and　propose　solutions.　In　response　to　this　sudden　situation,　we　conducted　data　mining　on　topics　and　discussions　related　to　the　opening　of　the　epidemic　on　Sina　Weibo,　collecting　125,686　interactive　comments.　We　used　artificial　intelligence　technology　to　analyze　the　attitudes　and　emotions　reflected　in　each　data　point,　identify　the　key　factors　that　contribute　to　these　attitudes　and　emotions,　explore　the　underlying　reasons,　and　find　corresponding　solutions.　ResultsThe　results　of　the　study　show　that　in　the　face　of　the　sudden　release　of　the　epidemic,　the　public　mostly　exhibited　negative　emotions　and　behaviors,　with　many　people　experiencing　anxiety　and　panic.　However,　the　gradual　resumption　of　daily　life　and　work　has　also　led　some　people　to　exhibit　positive　attitudes.　ConclusionThe　significance　of　this　study　is　to　help　the　government　and　institutions　understand　the　impact　of　policy　implementation　on　users,　and　to　enable　them　to　adjust　policies　in　a　timely　manner　to　respond　to　potential　social　risks.　The　government,　emergency　departments,　and　the　public　can　all　prepare　for　similar　situations　based　on　the　conclusions　of　this　study.