Four autoclaved aerated concrete(AAC) wall slabs with special truss model designed were prepared for studying their structural performance. The related loading and displacement of the three inspection stages, which are short term deflection, outgoing and bearing capacity, were obtained. The load displacement curves of wall slabs were plotted. The failure mode of the designed slab was shown to be bending shear failure mode especially bending failure. Then, the experimental result was analyzed by using the finite element software to obtain the steel bar stress. The simulated results are basically in agreement with those from experimental. Both the simulated and experimental results indicate that the mechanical properties of design autoclaved aerated concrete wall slab with special truss model are in accordance with relevant specifications.The average experimental value and numerical analysis value of bearing capacity reliable coefficient of AAC wall slab are 1.968 and 1.911, respectively. The conclusions presented in this paper can be a reference for later analysis in scopes of research and design and engineering applications.