Three qubits entanglement and Svetlichny inequality of generalized Greenberger-Horne-Zeilinger states were measrued. Based on the density matrix of the generalized Greenberger-Horne-Zeilinger states, the degree of tripartite entanglement was calculated. Through the experimental investigation of the three qubits generalized Greenberger-Horne-Zeilinger entanglement and Svetlichny inquality, the relation between the entanglement and nonlocality property was obtained. The results show that the three-body entang lement measurement valuse are lonsistent with the theoretical values within the limits of experimental error. The expectation values of Svetlichny operator are consistent with the theoretical results. The nonlocal properties are closely related to the degree of the entangled system. The nonlocal properties decrease as the entanglement derates.