Glass fiber reinforced polymer(GFRP) rebar has been most commonly used in civil engineering. Bond behavior of sand coated GFRP rebar in confined concrete was systematically analyzed. Test results of 30 losberg pullout specimens show that the experimental bond stress slip curves for GFRP rebar in confined concrete(τ s curve) is composed of micro slippage section, slippage section, descending section, second rising section and residual descending section. For the GFRP rebar specimens in confined concrete, only pullout failure occurred, however, the mode of failure of GFRP rebar specimens in unconfined concrete showed pullout failure and splitting failure. The strength of GFRP rebar in confined concrete is 1.00116 times that of concrete without stirrups. The slippage of the first peak point in concrete confined by stirrups is 1.202.76 times that of concrete without stirrups. Based on experimental results, the theoretical model of bond stress slip relationship for GFRP rebar in confined concrete is established.