Aiming at the existing problems in modular construction, the article compares modular construction with Mies and Louis Kahn’s tectonic expression from a point of the gap in module connection. By applying the method of case study and diagram generating, the research gives the tectonics reflections in module connection from the aspect of thought about “skin & bone” and the interval of module, in order to make module connection present poetic logic of construction and align with the design system, while further clarifying and enriching the significance of combining architectural design and operation that architecture “design with construction” which based on modular system.