The domestic research of the steel plate concrete structures have been focused on the nuclear structures that usually reqire large strength. This research tried to establish some basic design information of SC structures using non-cement concrete. This paper studied on the compressive characteristics, effective length factors subjected to the concentrated compression loadings. The effective length factors were calculated by Euler Column Theory rather than using Plate Buckling Theory. The strains which are requird in calculating the effective length factor were measured to caculate the effective length factor at the yield of surface steel plate, the buckling of surface steel plate and the failure of concrete.