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First the kinetic energy,potential energy and fluid force of the motion of wire in the wire guide system are discussed;And the dynamic model is established based on the improved Hamilton principle of the variable mass system.Then a kind of dichotomy being improved from the traditional dichotomy used in the one-dimensional nonlinear is designed for the dynamic model of wire.This improve dichotomy will not only solve the problem of large and singularity of Jacobi matrix in the Newton iterative method but also own the global convergence.At last the simulation results from MATLAB show that the greater the speed along the winding core,the less the change of the wire’s length and quality when a circle of wires are finished.