Abstract: Perfobond connectors are widely used in steel-concrete composite structures. However, there are few researches on pullout experiments of perfobond connectors in high strength concrete. Therefore, based on the super-high steel plate-concrete composite bridge towers, 51 pull-out experiments were carried out on 8 groups of perfobond connectors using high strength concrete. Investigated were parameters including hole diameter, steel bar diameter, hole bottom distance, plate thickness, steel bar position in the hole, concrete strength and others to determine their effects on pullout performance of perfobond connectors and to reveal the failure modes. Test results show that the ductility of perfobond connectors in C80 high strength concrete is satisfied. Two typical failure modes can be defined. The first mode is characterized by the shear fracture of rebar and by the total crushing of concrete dowels, without obvious failure of the steel plate. While the second mode is characterized by the failure or the obvious plastic deformation of the steel plate without shear fracture of rebar. Finally, several formulas for the shear capacity of perfobond connectors from relevant literature are summarized and compared. It is demonstrated that the influence of concrete end bearing effect on the accuracy of shear capacity formulas cannot be ignored. Based on the experiments in this study, the shear capacity formulas are proposed for perfobond connectors in C80 high strength concrete considering two different failure modes.