Cluster entangled state is the fundamental resource of one-way quantum computation. Star Cluster state can be applied to build quantum network. Based on two-mode squeezing states generated by nondegenerate optical parametric amplifiers an experimental generation scheme of continuous-variable six-partite and eight-partite star Cluster entangled states is designed, and the corresponding quantum inseparability criteria is deduced. The calculation results show that when the gain factors in inseparability criteria is set to be 1, Cluster entanglement should be prepared with some initial squeezing. But when optimal gain factors are chosen, star Cluster entanglement can be demonstrated with low squeezing. The calculation provides a direct reference for designing experimental system.