Intentional imagination refers to the imagination consciously carried out according to a certain purpose. Intentional imagination can be divided into recreating imagination and creating imagination. Reconstruction of imagination is the process of forming a new image in the human brain according to the description and instructions of words, patterns and music. Creative imagination is a process of independently creating new images in people's minds according to certain purposes and tasks. Fantasy is a special form of creative imagination, which refers to the imagination related to personal wishes and pointing to future things. Fantasy is divided into ideal and fantasy. Ideal refers to an illusion that conforms to objective laws and social conditions and can be realized through hard work. Utopia refers to an illusion that objective laws and social conditions cannot be realized. Unintentional imagination refers to unconscious imagination without a predetermined purpose. When people's consciousness is weakened, they can't help but imagine something under some stimulus. Dream is a typical form of unconscious imagination, a strange imagination that people have no purpose and can't help themselves when they are asleep.