The CS-Frame Structure System is an innovative construction model developed by Open for multi-story frame structure buildings. Its uniquely invented "four-corner steel tube and plate combination columns" matched with on-site prefabricated concrete beams, support-free steel trusses combined with concrete beams, and steel truss floor bearing plates form an innovative architectural system. The CS-Frame System, with core technologies like CS-Frame columns, CS-Frame beams, optimized chord beams, optimized end beams, optimized ribs, and optimized nodes, can be flexibly combined as needed, overcoming the disadvantages of high formwork construction methods, suitable for constructing various types of multi-story frame buildings.