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Little bright spot defects on galvanized steel sheets were studied by optical microscope,scanning electron microscope( SEM) and Energy Dispersive Spectrometer ( EDS ) in this study.The research shows that the coating thickness of little bright spot defect is much lower than normal area which caused by the substrate defect justly under little bright spot,and when skin passed,the little bright spot defect area can not touch with skin pass roll which result in the surface of little bright spot is flat while normal area is rough.The different coating morphologies have different effects on the reflection of light and which cause the little bright spot defect lighter than normal area.