  This paper is concerned with existence of solutions to the incompressible
non-resistive viscous magnetohydrodynamic (MHD) equations with large initial
perturbations in there-dimensional (3D) periodic domains (in Lagrangian
coordinates). Motivated by the Diophantine condition imposed by the approximate
theory of non-resistive MHD equations in \cite{BCSCSPLL}, Chen--Zhang--Zhou in
\cite{chen2021} and the magnetic inhibition mechanism of Lagrangian coordinates
version in our previous paper \cite{JFJSOMITIN}, we prove the existence of
unique classical solutions under some class of large initial perturbations,
where the intensity of impressive magnetic fields depends increasingly on the $
H^{17}\times H^{21}$-norm of the initial perturbation of both the velocity and
magnetic field. Our result not only mathematically verifies that magnetic
fields prevent the singularity formation of solutions with large initial
velocity in the viscous case, but also provide a starting point for the
existence theory of large perturbation solutions of the 3D non-resistive
viscous MHD equations. In addition, we further rigorously prove that, for large
time or strong magnetic field, the MHD equations reduce to the corresponding
linearized equations by providing the error estimates, which enjoy the types of
algebraic decay with respect to the both of time and field intensity, between
the solutions of both the nonlinear and linear equations.
