C2-System House is a modular product basing on shipping container and is generally called as ISO flat pack container house. It is a modular container type house using cold-formed thin-walled steel and customized profile steel as skeleton (with top frame and base structure wholly welded), sandwich panel as wall system and single layer color steel sheet with insulation material as roofing system. With standard container house as basic unit, it can be used individually or can be flexibly combined in horizontal or vertical direction.