Family moral education is the primary stage of the whole moral education, and moral education must seize the opportunity and grasp the family as the primary position of moral education. According to the theory of "first cause effect" or "first impression effect" of American psychologist Lochines, first impression has an important influence on individual psychology. Whether the first impression is correct or not, its influence on people is vivid and profound, and it will affect the individual's cognition of related issues in the future.

Modern psychological research also proves that preschool period is the key period of behavioral norms. During this period, children should form a sense of norms, develop a good code of conduct, learn to deal with interpersonal relationships around them, enhance their sense of cooperation, actively integrate into group life, and avoid forming self-centered habits. Therefore, in preschool period, family moral education should be carried out to promote the harmonious development of preschool children's body and mind.