Abstract: In order to study influences of changing supporting conditions and the basic stiffness or not on the structural responses, different finite element models were established to simulate the behaviors of coal shed skeleton structure. The structural parameters including natural vibration periods, modes, support reaction forces, member inner forces, and displacements were analyzed and compared. It was shown that the basic stiffness has a greater impact on the structural mechanical properties when using the three-limb floor support. Meanwhile, when selecting the two-limb floor support form, there are few significant differences observed among the force characteristics with different supporting conditions. Simultaneously, the basic stiffness effects slightly on the characteristics. Furthermore, it is recommended to use hinges as the boundary condition. hinges are recommended as the boundary condition.