Abstract： A multidegree of freedom vibration model for wire transport system was developed to analyze the effects of material and diameters of wire electrode, diameters and mass of wheels, and the length of wire electrode between two adjacent wheels on the natural frequency of the wire transport system. And the obtained conclusions through simulation analysis were used to increase the natural frequency of the wire transport system, thereby reducing the possibility of resonance and decreasing the position fluctuations of discharge area. The effects of wire running speeds, wrap angles of wire electrode on wheel guide, and wire electrode tension on the position fluctuation rang of discharge area were experimentally studied. Finally, a micro shaft with a diameter of (50±1) μm was successfully fabricated. The experimental results show that the designed wire electrical discharge grinding(WEDG) device and optimal parameters obtained through experimental study can be used to process micro shafts with high dimensional accuracy.