The article highlights the features of the architecture and urban planning structure of the utopian city-state described by the German theologian Johannes Valentinus Andrea in the treatise «Description of the Republic of Christianopolis» which was written in 1619. The aim of this article is a detailed analysis and graphic reproduction of the urban planning and architectural features of the utopian city described by J. V. Andreae. One of the tasks is to compare the structure of the city-state he recreated with the layout of the utopian settlements of T. More, T. Campanella and A. F. Doni, as those written in approximately the same period and depicting utopian states located on remote islands. Republic of Christianopolis is built in the shape of a perfect square, symbolizing order and rationality. Each side of the city is of equal length, and all the streets are laid out to form a regular, neat grid. In the center of the city there is a large square with a temple. This temple serves as the spiritual and civic nucleus of the city, underscoring the significance of religion and communal life in a utopian society. The city-state is divided into different zones according to their functional purpose. There are separate plots for residential buildings, administrative buildings, scientific institutes and agricultural areas. Such planning reflects a desire for efficiency and organization. Residential buildings are organized in such a way that each family has adequate housing with sufficient space for comfortable living. Gardens are located around the houses, which helps to create a public space for communication and interaction between residents. Despite the utopian nature of the society, the city has defensive structures such as walls and towers, which indicate a desire to protect the city from external threats. The article depicts a schematic general plan of the city of Christianopolis, conventional plans and sections of buildings. A review of the urban design features in J.V. Andreae's utopia compared to those in the works by T. More, A. F. Doni, and T. Campanella reveals common tendencies typical for that era, such as the ideal city shape, a preference for symmetry and centralized planning. It should be highlighted that in the treatise «Description of the Republic of Christianopolis», there is a more distinct zoning of areas and division of the population. J. V. Andrea created a utopian society where scientific knowledge and Christian faith are harmoniously combined. Christianopolis is depicted as a place where education and spirituality are integrated, reflecting the ideals of its era and the pursuit of knowledge. Keywords: utopia, symmetrical planning, urban structure, city fortifications, residential buildings.