In order to explore the dynamic relationships among gratitude,forgiveness and depression in undergraduates,152 undergraduates were involved in the four-month tracking investigation by adolescent gratitude scale(AGS),Hearland forgiveness scale(HFS)and center for epidemiologic studies depression scale(CES-D).The dynamic relationships among gratitude,forgiveness and depression were examined by structural equation model.The results showed that gratitude,forgiveness and depression in pretest could predict correspondent post-test level significantly and positively.Forgiveness played partial mediatin...