This paper studies the enhanced efficiency of the field strength coupled into slots by using the finite difference time domain method. The coupled field strength with the different slots shape, size, and polarization direction is assisted, some useful rules are concluded. The easiest to form enhanced efficiency of field strength is rectangular slots, square slots are the second, and the most difficult slots are round. For aspect ratios (long side/short side) of the rectangular slots, the bigger

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... the more easily to form enhanced efficiency. When the polarization direction is perpendicular to the short side of rectangular slots, it is harder to form slots enhanced efficiency. This paper provides a practical method to research enhanced efficiency, it also provides theory basis for the slot shape selection, slot size design, and the polarization direction selection to improve the efficiency of the shield.