With the rapid development of ternary organic photovoltaics (OPVs), exploring highly efficient matching ternary components has become a key issue. Herein, a ternary OPV was fabricated using J71 and PBDTTS-2FQx as donors and IT-4F as the acceptor. Binary devices based on J71:IT-4F and PBDTTS-2FQx:IT-4F achieved power conversion efficiencies (PCEs) of 9.52% and 6.44%, respectively. By leveraging the advantages of the two systems, a ternary OPV incorporating both donors was successfully prepared. With a weight ratio of J71:PBDTTS-2FQx:IT-4F of 0.85 : 0.15 : 1, the ternary OPV achieved an optimum PCE of 11.23%, along with improved short-circuit current density (JSC) and fill factor (FF). Moreover, the ternary OPVs exhibited substantially enhanced stability relative to the binary ones. The unencapsulated J71:IT-4F OPV retained 80% of its initial PCE after 530 h, while the unencapsulated ternary OPV retained 80% efficiency after 1000 h. This enhanced stability arises from the good compatibility between J71 and PBDTTS-2FQx, which facilitates the formation of an alloy-like donor phase.