[en] Full text: The control of magnetic islands is one of important issues for magnetically confined fusion plasmas. Magnetic islands strongly affect the achievable β''-value by modifying transports, equilibrium fields (i.e. radial profiles of electric current, pressure and electric field) and the stability of plasmas. The induction of resonant helical magnetic fields, which interact with magnetic islands, is an effective method to control the dynamics of magnetic islands. In the Large Helical Device (LHD), magnetic islands are excited by the external magnetic, and the generation of equilibrium poloidal E x B flows by magnetic islands is observed. On the other hand, the external helical magnetic fields have been used to control the poloidal rotation and the stability of magnetic islands in tokamak plasmas. The error field, which is caused by the misalignment of toroidal magnetic coil, plays a similar role to the external helical magnetic field. The locking of the rotation of magnetic islands by error field triggers the disruption in tokamak plasmas. Thus, it is important to understand the basic mechanism of the interaction between magnetic islands and external helical magnetic fields. In this study, nonlinear simulation of drift tearing mode is performed using a set of reduced two-fluid equations, and the detailed study of the interaction between magnetic islands with external helical magnetic fields is reported. The external helical field associated with magnetic islands is imposed by means of finite amplitude of perturbed magnetic flux (vector potential) at edge boundary. In our simulation, the locking (stop) of the rotation of magnetic islands is observed. The rotation of magnetic island is basically driven by the diamagnetic drift flow and E x B flow. It is found that contributions of these flows approximately cancel each other inside the separatrix of magnetic island in the locking phase. The detailed mechanism of the locking of magnetic island rotation is discussed in the presentation. (author)