Design method of PCB (printed circuit board) controllable impedance through holes

The invention provides a design method of PCB (printed circuit board) controllable impedance through holes. A PCB is provided with a central signal through hole; ground through holes are arranged around the central signal through hole; the ground through holes function in shielding thus a uniformly distributed impedance is generated; the four ground through holes are arranged around the central signal through hole in a circle replacing a traditional uniformly-distributed shield; capacitance is generated between each ground through hole and the central signal through hole; the calculation of the capacitances is determined by the diameter and dielectric constant of the central signal through hole and distances between the central signal through hole and the ground through holes; the ground through holes around the central signal through hole provide a reflow path for signals; an inductance loop is generated between the central signal through holes and the ground through holes; an adjustable impedance vertical channel is accordingly generated; moderate parameters are calculated and selected, thus allowing transmission line impedance continuity and signal completeness.