The present invention of skin improvement device and method includes; Multiple needles with sharp ends; A fixture that needles are embedded onto; A drive system that drives movement directly or indirectly to the fixture for the above needles to be inserted into skin; and An electric transmission that is connected to the above needles electrically is also included. The applied electricity is alternating current, the form of signal is high frequency and the needles are bipolar. Na-Plus Effect happens when the heated areas of Na-Effect in dermis expand and are connected in dermis, not in epidermis.