The aim of this final work is to describe closer the life and work of Maria Montessori, her pedagogy and ideas, and the importance of the impact of prepared environment on child's development. At the beginning, the life of Mary and the process of bringing the pedagogical method to life are described. All assumptions and principles of pedagogy are presented, which also explain its goals, view and approach to the child. The child is at the center and needs to be approached with respect and seen as an equal participant in their own upbringing. It strives for independence, so great importance is attached to the child's independence and the need to provide freedom in order for him to take the initiative and make progress in selfeducation. Working with children should be guided by the basic principle of "Help me to do it myself" and let the children shape their personality independently. A prepared environment that is stimulative that is adapted to the age, abilities, needs and interests of the child greatly contributes to the development of quality abilities and skills. It also contributes to physical, social and cognitive development. It consists of specially made materials and a space that allows the child freedom of movement. Montessori material allows the child to experience and experience the world around them with their own hands. They are divided into material for practical life exercises, material for language, material for the senses, material for mathematics and material for space education. Montessori space with adequate content stimulates the child's curiosity, curiosity and interest in learning. It is a means by which it improves its own development processes. The prepared environment should be provided by an educator who should observe the child, but from a safe distance. Direct support should not be interfered with and direct support should be avoided because any help if the child does not ask for it is unnecessary.