Effectiveness of School-Based Psychosocial Interventions on Mental Health Among Chinese Rural Children with Traumatic Experiences: a Cluster Randomized Controlled Trial

INTERVENTION: Group of students 1:Psychosocial interventions;Group of students 2:psychosocial interventions; CONDITION: Mental health PRIMARY OUTCOME: ptsd;depression;anxiety; SECONDARY OUTCOME: quality of life;bullying;Stress resistance;Coping Styles;family and school enviornment; INCLUSION CRITERIA: As school is our intervention unit, the inclusion criterion is that the school should not have a similar psychosocial intervention program. For students, all children in the program schools who have signed informed consent will participate in this program.