Abstract: A test of 10 scaled models was performed on double steel plates and concrete infill composite shear walls for nuclear engineering, and the influence of several parameters including the thickness of the steel plate, stud spacing, vertical load, stiffener on in-plane flexural behavior of double steel plate and concrete infill composite shear walls (SCSW) were studied based on the test results. The results indicate that the thickness of the steel plate, vertical load and stiffener all have a great effect on the in-plane flexural behavior of SCSW while the stud spacing has little impact. The SCSW specimens were simulated by using the finite element software ABAQUS. It is found that both the finite element calculation values and the test values of the flexural behavior of SCSW had a good agreement, but the curves of the finite element calculation did not have apparent declination. Combined with the experimental results and finite element numerical simulation, a calculation formula of flexural behavior of SCSW was proposed. This study provides a theoretical basis for the design and application of composite shear walls with double steel plates and filled concrete.