Abstract: To study the lateral resistance of steel frame infilled with cold-formed thin-walled steel shear wall structures, four full-scale specimens were tested under horizontal reversed cyclic loading. The shear properties of specimens with different configurations were compared, and the influence of the thickness of the magnesium crystal panel and the rigid diagonal bracing on the shear performance of the structure were also considered. The test results indicate that: the combination of steel frame and cold-formed thin-walled steel shear wall has good shear resistance; the shear capacity and elastic lateral stiffness of the shear wall can be improved by adding rigid diagonal bracing or by increasing the thickness of magnesium crystal panel; and thusly improve the overall lateral resistance of the structure. Combined with the failure characteristics, the mechanical properties of this structure could be divided into two stages. The distribution and variation of horizontal shear forces between steel frames and shear walls were analyzed. The shear force sharing rate of shear walls was 70%-84% in the early stage, while that of steel frames was increased to 72%-75% in the later stage, indicating that this type of structure is a typical dual lateral force resistance system.