The reinforcement of earthen sites always focuses on quality of the anchor system. Currently, pullout testing is the only way to test earthen site anchor systems. This research used nondestructive testing technology for the first time to evaluate glass fiber reinforced polymer (GFRP) anchor system in earthen sites.In the Hongshabao and Yongtaisites, in Gansu Province, GFRP anchor system in earthen sites was tested by using a nondestructive anchortesting instrument and a pullout apparatus.By comparing the actual measuring bolt length and instrument measuring bolt length, it is found that the length index is good at judging the validity of results measured using the nondestructive detector. In comparison with bolt pullout testing results, it is confirmed that the nondestructive method for testing GFRP anchor system in earthen sites is suitable and accurate. The results of nondestructive testing of GFRP anchor system of earth sites is proved to be accurate.