Abstract: With the advancement of science and technology and the concept of green environmental protection, China's construction industry is gradually moving towards green and sustainable buildings. The application of glass fiber-reinforced polymer (GFRP) anchor rods instead of the traditional steel anchor rods and underground anti-floating engineering can not only save the engineering cost effectively, but also extend the service life of anti-floating structures and prevent the pollution of corrosion steel bars to underground environment. In order to further explore the changes of mechanical properties of large-diameter GFRP anti-floating bolts under long-term stress, an indoor full-scale test on GFRP anti-floating bolts is conducted by applying long-term loads. The test results show that the test bolt does not creep until 38%~45% of its failure load is applied. Through the standard linear solid model, the creep law of GFRP anti-floating bolts is investigated. The model fits the stiffness versus time curve, and the fitted curve agrees well with the measured one. Furthermore, the combination of damage mechanics theory and creep model is used to derive the uplift capacity of GFRP anti-floating anchors, and the accurate prediction of long-term bearing capacity of GFRP anti-floating anchors is realized, which provides a theoretical basis for the application of GFRP anchors in anti-floating engineering.