The morality comprises moral cognitions,moral feelings,and moral behaviors.There are four major theories in the area of moral psychology.They are psychoanalytic theory,social learning theory,cognitive-developmental theory,and evolutionary psychology.These theories disagree regarding the major issues of moral psychology.These issues includes concept and structure of morality,whether morality is constructed by environment or by individuals themselves,whether morality develops incrementally or stage by stage,how moral cognitions relate to moral behaviors.