Abstract: The partial stress concentration effect in traditional rock bolt is significant, which would lead to overall failure of rock bolt. Therefore, we applied experiential method to explore the relationship between bolt bearing capacity and anchor thorn layers, strength of mortar and the block size through improving the bearing capacity of anchor by adding anchor thorn in the anchorage section. From the test, the we get conclusions that: firstly, the different bolt bearing capacity has a linear relation with the early stress of cement mortar at the early stage, while, after reaching a certain intensity, the relation would change to be nonlinear, which means that greater mortar strength does not represents better function; secondly, based on the experience results, we can conclude that under the condition of single anchor thorn, the bearing capacity of anchor increases with the size of the test cube, which represents that given a certain level of anchor thorn stress, the anchor bearing capacity is positively related to the thickness of the cement mortar.