Abstract: The modular composite shear wall with double steel plates and infill concrete is easy to disassemble and assemble, which can realize the flexibility of architectural design. In order to study the seismic performance of the modular composite shear wall, quasi-static tests of nine specimens were conducted. The mechanical performance and failure mode of the shear wall under low cycle reciprocating load were studied. The test results show that: the modular composite shear wall has good bearing capacity, good dismount ability, full hysteretic curve and superior seismic performance. The average displacement ductility coefficient is 2.3. The ductility of the shear wall specimens is good, and the specimens have good deformation capacity after yielding. The more the number of wall elements, the lower the bearing capacity and the lower the initial stiffness, but the wall has better ductility and better energy dissipation capacity at large displacement. High axial compression ratio can obtain higher yield load and peak load, but the failure process is rapid and the ductility is poor.