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Based on the quantum fluctuations, we adopt the method of generalized V1 criterion to investigate multipartite entan-glement characteristics in an optical parametric amplification system with the consideration of dispersion. The nonlinear interaction becomes strong because of the existence of dispersion coefficientσ. Considering the influence of dispersion factorσ, with increasing the pump parameter μ , the value of minimum variance V1 decreases and the squeezing curve nearly equals 1/(1+μ ). The larger particle number N results in a smaller variance and higher entanglement.