Objective To explore the time change of mental health and its influencing factors among adolescents in an earthquake-hit area after the disaster. Methods Grade one students from tw o junior high schools in the severely and slightly earthquake-hit areas of Wenchuan w ere selected for a survey w ith 5 follow-ups during 2 years. Analysis of variance and latent variable grow th curve in structure equation model w ere used in statistical analyses. Results Totally 977students( 49% boys and 51% girls) participated...