Abstract: A low-rise prefabricated house system includes beams, columns, doors, windows, stairs and floor. The system is characterized in that the house includes two or more than two stress columns, two or more than two basic modules, two or more than two basic elements and two or more than two composite elements, wherein each basic element consists of more than four basic modules; each composite element includes at least one basic element; the composite elements and the basic elements are assembled together to form a basic plane; and stress columns are arranged at intersection points of orthogonal meshes formed by plane control axial lines and outer contour lines of various basic elements. The modular and unit type overall control of the house is realized by controlling the composition method of house planes and controlling the building relationship between the planes and building elements such as column, wall, stairs and roof covering.