Abstract: Glass fiber reinforced polymer (GFRP) composites had been applied in more and more anti-floating construction with their advantages such as high tensile strength, resistance to corrosion, low electromagnetic properties and so on, but the researched about their properties after bending are insufficient. To find the mechanical properties of bending GFRP composite anti-floating anchor, the paper studied the anchorage performance of straight and bended GFRP composite anchor bolt on the basis of a full-scale pullout test consisted of 8 surface sticky sand GFRP composite anti-floating anchors and 8 thread steel anti-floating anchors. The results show that the curved GFRP composites are unfavorable for improving the ultimate bearing capacity, and the longer with the bending length, the lower the ultimate bearing capacity is. However, bending treatment can effectively limit the displacement of the anchor bolt in the bottom plate, and the longer with the bending length, the more obvious the limiting effect shows. Increasing the anchorage length can effectively limit the displacement and improve the bearing capacity of the anchor bolts. The paper also introduces anti-floating anchor bending effect coefficient and puts forward the question which needs to be researched in the future based on the discussion of the influence about the anchorage properties of anchor bolts after bending.