Since Last Three Decades Adolescents Have Become More Prone to Commit Crime. Whose Main Reasons Are Attributing of Personality, Which Are Influenced By Negativity. Neuroticism Is a Personality Trait, It Does Interpret the Negative Aspect and Deffence Machanisms Define How an Individual Deal With Those Stress. the Objective of Our Research Is Systematically Reviewed and Finds the Relation Between Defense Mechenism and Neuroticism. In Conclusion, Mature Defense Mechanisms Are Associated With Better Adaptive Functioning and Health, Immature Defense Which Are Correlated Negatively With Measures of Adaptive Adult Functioning. Interestingly, Neurotic Defense Mechanisms Correlated With High Levels of Distress and Impairment.