Abstract: Twelve beam-type specimens in four groups were tested to investigate the bond properties between high-strength lightweight aggregate concrete (HSLC) and high-strength steel bars (HSSB), and the effects of steel fiber content and, of concrete strength on the failure mode, on the bond strength, and on the bond stress-slip curve were compared. Based on the thick-walled cylinder model considering the confinement effect of stirrups and the fracture energy of lightweight aggregate concrete (LWAC), an analytical expression for bond strength and a bond stress-slip constitutive model were established. The research results show that: the bond strength is in the range of 25.41 MPa~38.00 MPa, and progressively enhanced by increasing the steel fiber content and concrete strength. The descending slope of bond stress-slip curves and failure mode of specimens are gradually improved with the increase of steel fiber content. The predicted results by the bond strength and bond stress-slip models are in a good agreement with the experimental results. Taking into account the three-dimensional random distribution of steel fibers, proposed are the material characteristics of LWAC, the bond stress-slip relationship between HSLC and HSSB, and a maximum crack width model for HSLC beams reinforced with HSSB, and the accuracy is verified by the crack results of seven flexural beams. The model proposed can reasonably reflect the cracking behavior and stress mechanism of the members.