This study investigated the causal relationship between stress and aggression in children using data from a 5-year(2004, 2005, 2006, 2007, 2008). The participants were 2844 children (1524 boys, 1320 girls) taken from the KYPS 2004(4th grader)- 2008 (8th grader). Cross-lagged autoregressive analyses indicated that：(1) While stress in 4th grader influenced aggression in 5th grader, aggression in 6th grader influenced stress in 7th grader. (2) Stress and aggression reciprocally influenced in 5th grader-6th grader, and 7th grader-8th grader.
Key words：Aggression, Cross-lagged Autoregressive Model, Right to Development, Stress.