The improvement of soft foundation is characterized by large-area, tight construction period and great working difficulties. It turns to be a knot to treat the large-area and super-soft foundation effectively and rapidly at a low price. CCCC Fourth Harbor Engineering Institute has been engaged in the research on the treatment technology of the soft foundation and obtained many innovations. This paper introduces systematically these innovations from the theory, technology, monitoring and checking, as well as energy saving, which can be helpful for the design and construction of treatment for the large-area and super-soft foundation .