Concrete-filled circular spiral steel tubes (CFST) were tested under cyclic lateral force and a constant axial load. The welded part of this steel tube form a spiral and the seam-welded part is thicker than the steel tube wall. The test results showed that filling in steel tube with concrete enhanced the loading capacity and ductility of the CFST, and the spiral-welded part had no influence on the tube's flexural behavior. It was confirmed that the evaluation of the seismic performance of CFSTs does not need to take the existence of a spiral-welded part into consideration, and the relationship between load and horizontal displacement of CFSTs can be evaluated based on current design specifications.