Abstract: Based on the theory of electromagnetics, the mutual coupling matrix model between the elements of an electromagnetic vector sensor is put forward in this paper. Using one reference signal source and according the subspace theory, the coupled array manifold is obtained. According the relation between the coupled and the uncoupled array manifolds and by matrix operations, the least squares solution of normalized coupling matrix is obtained. The whole array is calibrated by array elements being calibrated one by one. Finally, the simulation results demonstrate that this approach is correct and effective.