The abrasive particles dispersion typed functional fluids have been found to reciprocate between electrodes under AC field at low frequencies. We have tested the positive use of this phenomenon for finishing process on chips of the micro cutting tools. In this study, in order to be a more long life time performance of the micro cutting tools. We developed the new way of finishing method using the functional fluid under AC. electric field. This finishing method is easy to improve more long life time of micro tool that be treated the new finishing.