The　building　of　cabin　hospitals　in　Wuhan　has　been　proven　to　be　clinically　successful　in　curing　mild-symptom　COVID-19　patients　shortly　after　the　outbreak　of　COVID-19　in　late　2019.　At　the　same　time,　the　psychological　effect　of　patients　being　treated　in　cabin　hospitals　and　the　features　of　the　psychological　status　of　the　whole　society　remained　ambiguous.　This　study　adopted　a　self-administrated　questionnaire　to　investigate　the　stress,　depression,　and　anxiety　status　of　patients　in　cabin　hospitals　(n　=　212)　and　healthy　participants　outside　of　Hubei　province　(n　=　221)　in　a　population　level　from　February　29　to　March　01,　2020.　The　research　measured　participants＇　stress　response,　depression　level,　and　anxiety　level　as　well　as　their　social　support　system　and　their　resilience　level.　Results　indicated　that　in　this　sudden　outbreak　of　an　unknown　pandemic,　all　people　(whether　or　not　infected)　showed　a　generally　high　level　of　stress,　depression,　and　anxiety,　regardless　of　age,　gender,　education　level,　and　employment.　It　also　showed　that　people　with　a　lower　level　of　psychological　resilience　and　social　support　reported　more　severe　symptoms　of　depression,　anxiety,　and　stress.　Moreover,　the　research　also　found　a　positive　effect　of　cabin　hospitals　on　the　psychological　recovery　of　COVID-19　patients.　Stress　response　of　patients　increased　after　entering　into　cabin　hospitals,　while　after　3-4　weeks＇　treatment,　patients　showed　a　decrease　in　their　depression　and　anxiety　levels.　This　research　advances　the　understanding　of　COVID-19　and　gives　suggestions　to　optimize　the　design　and　the　allocation　of　resources　in　cabin　hospitals　and　better　deal　with　the　unknown　pandemics　in　the　future.