Abstract: Based on the field test of immature earthen sites reinforced with the wood anchor and PS serosity.The different PS serosity material had little influence to the bolting force of the wood anchor.The length of the anchor was not suitable to be longer than 1.5 m to 2.0 m when the wood anchor and PS serosity were used to reinforce the immature earthen sites.The unit anchoring power of wood could be adopted to equal to 5 kN/ m,and the bolting force of the single anchor was larger than 4 kN/ m.It was suggested that the influence of the diameter of drill and the length of the anchor to the bolting force of the wood anchor should be studied and some new method should be adopted to the head of anchor when the wood anchor and PS serosity were used to reinforce the immature earthen sites.