Abstract: This paper analyzed the fluorescent indications problem on the surface of the spoiler columns on the tip and tenon of a certain model of hollow turbine blades. The ZL-27A penetrant was used to detect the turbine blades, and then acetone wipes were used to wipe off the fluorescent indications, identifying and marking the defective spoiler columns. Finally, the macroscopic and microscopic characteristics of the defects were observed and analyzed using a borescope and scanning electron microscope. The results showed that the uneven surface of the spoiler columns was the main cause of fluorescent indications. After wiping, linear fluorescent indications on the spoiler columns indicated cracks, while circular fluorescent indicated looseness. The defects were caused by casting process. For parts with fluorescent indications on the spoiler column location, acceptance should be rejected.