It is very difficult to apply a uniform impact (explosion) loads on the structural member in the laboratory. We presented an innovative loading apparatus using a drop hammer impacting on the airbag to simulate the uniform loads,and proposed a two-DOF (degree-of-freedom) analytical model. The fundamental mechanical equation, boundary conditions and solution method were given and verified. A fine finite element model was established and the loading effects on the divided area were compared to verify the feasibility of presented apparatus. Some key factors of the dynamic loads were also discussed, including stiffness, load duration and damping ratio.The results show that the presented apparatus can be applied to simulate the uniform dynamic loads with choosing parameters,which provides a possibility for experiments simulating blast loading in the laboratory.