Abstract:ince Legal Psychology was on the historical stage in the early twentieth century, it has played the unique influence on law, psychology, and human society. Especially, the applications of the researches in Investigative Psychology, Forensic Psychology, Criminal Psychology, and Criminal Psychological Correction to Criminal Justice have offered the technological and theoretical support to detect criminal, punish the offender, and correct the criminal, contributed a lot to social justice. As an applied discipline to promote judicial justice has been known by people in the legal practice because everyone in the society cannot avoid contacting the law, Legal Psychology, even Psychology, enter the vision of social public. The future research should expand the field, focus on the practice, and emphasize the theoretical construction; the discipline development should also foster the talent’s training and pay attention to the cross discipline.