In order to study the optimality conditions of the second order cone coupled constrained variational inequalities, after equivalent transformation of the original problem, a minimax problem model was established by using the generalized saddle point problem, which was equivalent to a system of variational inequalities problem. The karush-kuhn-tucker (abbreviated as KKT) conditions of this system of variational inequalities were obtained. The Lagrange duality theory was applied to obtain the first-order necessity condition for the second-order cone coupled constrained variational inequalities. Based on the tangent cone of the constrained sets, the formula of the second-order tangent set and the duality theory, the second-order sufficiency condition of the second-order cone coupled constrained variational inequalities was derived. The analysis of the optimality condition for the second-order cone coupled constrained variational inequalities provides theoretical support for the study of the existence and convergence of the solution to the second-order cone coupled constrained variational inequalities.
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