As a new type of material, Glass Fiber Polymer-Soil nailing (GFP-SN) can replace the steel to be applied in the slope support, excavation support and other civil engineering. It was being concerned by more and more engineers. GFP-SN anchorage mechanism need be analysized and studied deeply to be used well. In this paper, numerical simulation software FLAC3D was used to simulate the pullout tests of GFP-SN. The results show that the diameter of GFP-SN, the embedded length of GFP-SN and the maximum pull force had great influence on the drawing force, the pull force is proportional with them. Besides, it is obvious that the embedded mode of GFP-SN has a certain influence on bar’s drawing force property.