Abstract:Objective Toexploretheeffectsofclowncareinterventionontheloneliness,psychologicaladjustmentand happinessoftheelderlyinnursinghomes.Methods Aclowncareteam wasformed,andaclowncareinterventionprogram wasdeveloped.Theclowncareinterventionprogram wasimplementedfrom MarchtoJune2024intwonursinghomeswith atotalof61olderadults.Theinterventioneffectsoftheclowncareprogram onthedepression,anxiety,loneliness, psychologicaladjustment,andhappinessoftheelderly wereevaluatedusingthePatientHealth Questionnairedepression module(PHQ-9),theGeneralizedAnxietyDisorder-7(GAD-7),theUniversityofCaliforniaLosAngelesLonelinessScale (UCLA-LS),the Nursing Home AdjustmentScale (NHAS),andthe Memorial Universityof Newfoudland Scaleof Happiness(MUNSH).Results Pre-interventionscoreswereasfollows:PHQ-9 (12.20±4.06),GAD-7 (12.21±3.95), UCLA-LS(45.34±16.62),NHAS (73.95±13.35),and MUNSH (23.69±10.44).Post-interventionscoresshowed significantimprovements:PHQ-9(10.30±4.61),GAD-7(10.44±4.30),UCLA-LS (39.80±16.74),NHAS (78.38± 13.14),and MUNSH (26.89±10.09).Allpost-interventionindicatorsdemonstratedstatisticallysignificantdifferences comparedtopre-interventionlevels(P<0.05).Conclusion Clowncarerelievesloneliness,suppressesnegativeemotions, andimprovespsychologicaladjustmentandhappinessoftheolderadultsinnursinghomes