The outcropped accretionary complexes in Duobuza-Bolong ore concentration area of northern Bangong Co-Nujiang metallogenic belt belongs to Non-Smith Strata which are totally disordered but partially ordered and deformed strongly. The researches show that the accretionary complexes were derived from the lateral accretion of Jurassic southern Qiangtang massif, which was related to the subduction from Meso-Tethys Bangong Co-Nujiang oceanic crust to Qiangtang massif. Qiangduo magma arc can be described as continental margin volcanic-magmatic arc based on accretionary wedge. This new understanding provides new clues for understanding the geological background of the Duobuza-Bolong superlarge porphyry copper-gold deposit and the evolution of the Bangong Co-Nujiang suture zone.