Aims: To chosing the locating patterns that have better biomechanical properties and more simpleand convenient for clinic. Methods f o fresh calf specimens were used in the study the stability of 4kinds of the FC(Fusing Cage)'s locating patterns was compared at these motion segments. Results;The sit f'fness and laxitt under all kinds of the conditions among the former 3 kinds of the FC'slocating patterns was similar. They have more stability than the forth one. The former 2 kinds ofthe patterns were used to treat the 14 patients with Low Back Pain and made satisfied effectpreliminary. Conclutlons: The most direct stability effect is neither from FC's orientation nor it'snumber. It is FC's diameter that will effect directly on the stability. If the FC's diameter and lengthare chosen properly. AFC patterns located either in the middle of interbody space at L5S1 orleft-lateral obliquely at L4.5 by anterior approachh would be effective and convenient.