Abstract: A simplifyied model for strength calculation of the composite shear wall panel with hidden frame, namely, rigid frame with equivalent diagonal strut is set up, which considers the effect of internal force redistribution of the composite wall panel due to its rigidity variation, and the width of equivalent diagonal strut and area of steel bars can be determined. The ultimate bearing capacity calculation method of the composite shear wall panel with hidden frame is developed, based on the analysis of the following bearing capacity calculation methods, including sandwich panel and hidden frame idealized as an equivalent diagonal strut and a rigid frame respectively, and anti-slide of the composite shear wall panel. Calculation results of the simplifyied model are analyzed comparatively with shear experiment results of the composite wall panel. Analysis shows that the calculation results using this simplifyied model and method for strength calculation conform to the experiment results, indicating the validity of this simplifyied model and method for strength calculation of the composite wall panel with hidden frame.