Abstract：The glass fiber reinforced plastic(GFRP) rebar is a kind of material formed with resin and glass fiber compound，with good mechanical properties and excellent corrosion resistance. The problem of durability of concrete can be solved if steel bars are substituted with GFRP rebar. Because GFRP rebar is easy to fracture，the chuck of testing machine can not hold big diameter sample，and the direct tensile test is difficult to perform. The commonly used method is processing into the small diameter sample and carrying on the test. Different diameter samples f 10，f 13，f 15 are tested；then the regression analysis for forecasting the mechanical properties of big diameter sample f 32 is implemented to avoid the influence caused by processed samples. The tensile test of the GFRP rebar is carried out；and the stress-strain curve and the failure modes of GFRP rebar are discussed. High strength and brittle failure are the most characters of GFRP rebar；and the stress-strain curve of GFRP rebar is found to be linear. Compared with the mechanical properties and prices between GFRP rebar and ribbed steel bars，the good mechanical properties and high performance/cost ratio of GFRP rebar can be testified. Meanwhile，the high strength of GFRP rebar and the good distortion coordination with concrete are testified. GFRP rebar can be used for slope engineering reinforcement in practice.
