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In this talk,a parallel symplectic PIC program for solving nonrelativistic Vlasov-Maxwell system on unstructured grids for realistic applications will be introduced.The implicit scheme is used in our code.We solve Maxwell equations on tetrahedral mesh by finite element method.An efficient and scalable parallel algebraic solver is used for solving the discrete system.Numerical results will be given to show that our method and parallel program is robust and scalable.