Mental representations of states are a special kind of representation of what has no matches in the objective material world, and therefore the study of psychological mechanisms and patterns of representations of the subject states will allow for a deeper understanding of the nature and functioning of the representations in the mental life of human, in the internal world. To study the explicit and implicit association, the free and implicit associative experiments were applied. In order to disclose the conceptual level, a subjective description of the students' states was performed. Estimation characteristics of mental state representations were by the method of semantic differential, followed by the determination of the leading structures. A questionnaire "Mental state relief" was used to study the characteristics of imaginative states. The paper presents the results of a study of level characteristics of phenomenological and experimental features of mental representations of students' mental states: figurative, conceptual, evaluative, and associative. Data suggests that the mental representation of the states represent the formations of a specific configuration and with specific features associated with the quality of the mental state: the spatial organization, the nuclear components, the variative characteristics, stability of the manifestations and the subject's independence of life situations. Mental representations of states have been considered as a result of the human way of life, as a certain format of a mental image, where the informative imaging of the experienced state takes place with its subsequent fixation in memory structures.