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Since the world-record power conversion efficiency of 15.7％ was achieved for organic solar cells (OSCs) in 2019,the newly developed non-fullerene acceptor (NFA) Y6 with an A-DA’D-A structure (A denotes an electron-accepting moiety,D denotes an electron-donating moiety) has attracted increasing attention.Subsequently,many new A-DA’D-A NFAs have been designed and synthesized,and the A-DA’D-A NFAs have played a significant role in the development of high-performance non-fullerene organic solar cells (NF-OSCs).Compared with the classical A-D-A-type acceptors,A-DA’D-A NFAs contain an electrondeficient core (such as benzothiadiazole (BT),benzotriazole (BTA),quinoxaline (Qx),or their derivatives) in the ladder-type fused rings to fine-tune the energy levels,broaden light absorption and achieve higher electron mobility of the NFAs.This review emphasizes the recent progress on these emerging A-DA’D-A (including Y-series) NFAs.The synthetic methods of DA’D-fused rings are introduced.The relationships between the chemical structure of the A-DA’D-A NFAs and the photovoltaic performance of the corresponding OSCs are summarized and discussed.Finally,issues and prospects for further improving photovoltaic performance of the OSCs are also proposed.