The Baishan tectonic belt is located in the conjunction region between northern and southern tectonic units in the Beishan orogenic collage. Various plutons, widely distributed in the Baishan tectonic belt, play important roles in recognizing the late Paleozoic teconic evolutions of the northern Beishan. In this study, we report new zircon U–Pb ages, bulk–rock major and trace element, and zircon Hf isotopic data for the Shuanjingzi pluton in the Baishan belt. Shuangjingzi granodiorite and K-feldspar granite have zircon LA-ICP MS U-Pb ages of 284.9±1.5 Ma and 327.6±1.6 Ma, respectively. Geochemical data show that they both are I-type granites with weak peraluminous, calc- alkaline characteristics, and display enrichments in large ion lithophile elements and depletions in high field strength elements. In addition, Shuangjingzi plutons display similar zircon Hf isotopic compositions. They both have relatively high εHf(t) values (7.92—12.24 and 5.87—10.28, respectively) and relatively juvenile TDM2 model ages ( 510—796 Ma and 679—961 Ma, respectively). Zircon Hf isotopic compositions indicate strong crustal growths in the northern Beishan during Carboniferous—Middle Permian. Our study and previous studies on Hongshishan ophiolitic mélange and volcanic rocks in the Baishan group all support a Paleo-ocean subduction setting in the Baishan tectonic belt during Carboniferous—Middle Permian. The Shuangjingzi pluton may derive from southward subduction processes of the Paleo-ocean represented by the Hongshishan ophiolitic mélange.