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In this presentation, I will introduce our recent progress in the construction of hydro-fluorenone and related structure using a mild photo-Nazarov reaction.1,2 The reaction conditions and scope of the photo-Nazarov reaction of aryl vinyl ketones were investigated.In contrast to the conventional acid-catalyzed methods, this photolytic electrocyclization proceeds in the neutral or basic conditions.We believe that the photo-Nazarov2 reaction is a beneficial supplement of the conventional Nazarov reaction.For the applications, total synthesis of taiwaniaquinol B2and gracilamine3, 4 was achieved applied this methodology as the key transformation.