The optimal composite anchorage structures and non-optimal composite anchorage structures were constituted by soil nail and groups of fixed-length empty holes that regular setting in the end of soil nail. The only difference between that two kinds of structures is differ in length; the former is optimal and the latter is empirical. The comparative test results show that the dynamic strain of the non-optimal composite anchorage structure is 2.1 times higher than that of the optimal composite anchorage structure. The particle acceleration of the non-optimal composite anchorage structure is 2(in vault) - 5(in floor) times higher than that of the optimal composite anchorage structure. The macroscopic results show that the blast-resistance of the optimal composite anchorage structure is 2.1 times higher than that of the non-optimal anchorage structure. Under the limit damage condition

the distortion about vault of the optimal composite anchorage structure is 25 percent of the non-optimal anchorage structure; and the fallen area about structure surface of the optimal composite anchorage structure is 33 percent of the non-optimal anchorage structure