Abstract：Rock bolting is a support method widely used in slope engineering，tunnel and large cave support，as well as reinforcement of building structure. As the main part of the support structure，the bolt must have enough reliability and durability. However，steel is easily eroded by the environment，so the durability of commonly used steel bolt should be paid more attention to. The glass fiber reinforced polymer(GFRP) bolt，which has better mechanical properties and corrosion resistances is a new kind of reinforcement material compounded with resin and glass fiber. The durability problem in slope engineering can be solved if the GFRP bolt takes the place of steel bars. The bolt stressometer and BOTDR monitoring technique are introduced；and the relationship between stress and strain of the GFRP bolt under cyclic tensile load is studied. The test result shows that BOTDR technique is a feasible method；and the monitoring effect is reliable. The stress of the GFRP bolt increases with the load increasing and decreases with the depth of the anchor increasing. The stress depth curve of the GFRP bolt agrees with regular hyperbolic pattern in the superficial part. With the length increasing，the distribution curve of the GFRP bolt transits in a lineal pattern. The stress transfer depth of the GFRP bolt increases with the cyclic tensile load and cyclic times；and the maximum stress depth of the GFRP bolt is less than 1.70 m under the test condition. The field test is undamaged one，and the maximum load of the test is 100 kN and does not reach the failure load of the GFRP bolt. So the damage course of the GFRP bolt must be further studied.
