In this study, the pyschobiographical method and relevant psychological theories were adopted to analyze Mo Yan's subconscious writing motivation based on his writings, his autobiography, and others' words. The results indicated that, Mo Yan of early childhood formed the close attachment to his mother. After dropping out of school, Mo Yan found the way to acquire the approval from his mother by a series of exploration, i.e., telling story in an appropriate way to attract the attention of his mother and those like her. In the process, he exhibited his abilities, realized his potential, and overcame the sense of inferiority. The subconscious motivation of Mo Yan might be to acquire his mother's approval by literary writing.