According to research of lithogeochemical, the authors think that the main body of  metavolcanite-sedimentary rock in Masongling mining area is calcalkaline series of metamorphic island arc, including a small quantity of alkali basalt and meta-normal sedimentary rock in metamorphic island arc, whose environment is of rifting land arc. Pengzhou type copper deposit maybe developed by subsequent reformation of previous VMS ore deposit. Metadiabase which is penecontemporaneous with volcanic-sedimentary rocks series belongs to island arc tholeiitic series. Mixed with transition crust materials continuously, the main body is characterized by high aluminium rock series.