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Ferrocenium monocations as photoinitiators for cationic photopolymerization suffer from a limitation of low absorption and low reactivity under high-pressure Hg lamp.Here,a ferrocenium dication salt,biphenyl bis [(π-cyclopentadienyl)iron]hexafluorophosphate[bis(Cp-Fe)-biphenyl](PF6)2 was synthesized by the ligand ex-change reaction between ferrocene and biphenyl.The chemical structure was characterized with FTIR and HNMR.The separation of ferrocenium monocation cyclopentadien-iron-biphenyl hexanuorophosphate([Cp-Fe-biphenyl]PF6) and dication [bis(Cp-Fe)-biphenyl](PF6)2 was carried out by coulumn chromatography.The photoactivity of initiating photolymerization of epoxide ERl4221 was studied as a cationic photoinitiator.[Bis(Cp-Fe)-biphenyl](PF6)2 can efficiently absorb radiation above 300nm and its photoactivity is higher than that of its monocation.