A seven ring electron acceptor PhQx-2FIC was designed and synthesized by using quinoxaline (Qx) containing fluorinated phenylalkoxy side chain as intermediate nucleus. The existence of multiple alkyl chains in the molecule ensured that PhQx-2FIC exhibited good solubility in common organic solvents and had strong absorption in the range of 300~800 nm. The energy conversion efficiency (PCE) of the device was 6.98% using PBDB-T as the donor material. The efficiency of devices based on PBDB-T:PhQx-2FIC(w(PBDB-T):w(PhQx-2FIC)=1.0:1.2) reached 7.74% after 0.5% 1-Chloronaphthalene(CN) and 110 ℃ annealing treatment due to the improvement in the exciton dissociation and collection efficiency in the device..