Abstract: Based on the fifteen patents in environmental geotechnical engineering and excavation engineering proposed by the author in recent years, the main elements of the recycling support system for foundation pits, are introduced including recycling retaining wall and recycling horizontal bearing structure. The recycling retaining wall can be the waterproofing steel precast piles (WSP), and the recycling horizontal bearing structure can be struts or recycling composite anchors (RCA). The construction, working principle and recycling process of the WSP and the RCA are introduced. The economic applicability of the recycling support system is discussed. The results show that this kind of support system is applicable to various soils and deep foundation pits. It is of economic and environmental benefits. The outcomes can be used by the designers, constructors, investors, management units in excavation engineering.