Using the methods of parametric down conversion and coherent superposit ion in composite beam splitter,four bits hyper-entangled Greenberger-Horne-Zeilinger states have b een prepared.Contrast and fidelity of the entangled system have also been measured.Through the theoretical analysis of Ard ehali inequality,we obtain a measurable Ardehali operator of the four qubit system.Using the relation between the expected value of Ardehali operator and the bit reversal noise intensity,the robustness of the four qubit system is investigated.The results show that the violation of Ardehali inequality versus local realism results decr eases with the noise intensity increasing.