Generally, the failure modes of FRP(Fiber Reinforced Polymer)-concrete composite structures are the interface peeling between FRP and concrete as well as the shear failure caused by insufficient shear bearing capacity of its own cross section. In this study, in order to improve the shear capacity of FRP-concrete composite structure, we tested five GFRP (Glass Fiber Reinforced Polymer)-Self-compacting RPC(Reactive Powder Concrete) stirrup composite specimens with GFRP shaped from multi-T-rib grooves. Discussion with the effects of interface treatment, stirrup configuration, and shear span ratio on composite specimens' mechanical properties. Measured the deflection and strain, respectively, and observed the formation and development process of cracks and their failure state. The results show that the interface sand adhesion treatment of GFRP plate and the arrangement of transverse penetrating reinforcement can enhance the interface shear strength between GFRP plate and concrete, obviously improve the cooperative performance of the two, and enhance the ultimate deformation capacity of composite specimens; the interface sand adhesion and stirrup arrangement can improve the shear bearing capacity of composite slabs and improve the failure mode to a certain extent; the higher the cross section of the specimen, the higher the bearing capacity, but the utilization of GFRP material will be reduced.