Abstract: A new type of double-skin steel-concrete composite shear wall with vertical seams between shear wall and boundary elements were proposed, and the wall plates are connected using bolts and plate connectors. Quasi-static tests on four specimens were carried out to study the seismic behavior of the composite shear wall. The results of tests were compared with the same types of composite shear walls without vertical seams, in which the upper and lower steel faceplates were weld together. The test results showed that the new type of double-skin steel-concrete shear wall had good seismic performance. The average values of the yield drift angle and ultimate drift angle of the four specimens were 1/169 and 1/37, respectively. The seams weakened the bearing capacity of the test specimen, but improved the ductility and the performance of energy consumption. The failure mode of specimens was bending failure at the bottom of the wall, indicating that the stress between walls could be effectively transmitted through bolts and plate connectors. A finite element model was developed using ABAQUS to analyze the performance of this type of double-skin composite shear wall. The force mechanism of bolt group in the plate connectors, the effects of vertical seams on the failure mode of boundary columns, and other factors including strength of material, shear-span ratio and axial compression ratio which may affect the performance of the composite shear wall, were also analyzed based on the FEM model.