Abstract: The subject of this research is the regularity of stages of formation of agency of a university student from the perspective of ecopsychological (ontological) model (Panov, 2019). The goal of this work consists in determining didactic grounds for formation of the stages of agency and research of the results of the forming experiment with their application. The stages of formation of agency (subject of motivation, “Observer”, “Apprentice”, “Student”, “Critic”, “Master” and “Creator”) define the specificity of assimilation of learning actions by the individual. Under the modeling of stages (forming experiment), this work implies targeted influence upon separate stages of formation of agency using special psychological-pedagogical conditions for the purposes of their development. The principles of modeling are formulated from the perspective of psychodidactic approach in unison with general didactic principles applicable to the process of formation of competences of a university student. The experiment was conducted with participation of 210 people. The control group consisted of 150 people, and experiment group consisted of 60 people. The results of the experiment demonstrated changes in the indexes of separate stages of formation of agency. For the first time the changes in the structure of stages of formation of agency using calculations of coefficient of connectedness are being cited. The work determines the correlation between changes of stages of agency with personal values in various spheres of life. The scientific novelty lies in the fact that based on the empirical data this work demonstrates the possibility of inclusion of development of value sphere into the psychodidactic circumstances that ensure formation and passage of stages of agency of university students in accord with the ecopsychological model.