Abstract: A method for desmearing pulse-type D.C. plasma and an apparatus for the method, the apparatus has a vacuum chamber for a vacuum pumping system to make the chamber a vacuum state. An electrode holder is provided in the vacuum chamber for a plurality of electrode plates separately mounted thereon in a line. The electrode plates use a pulse-type D.C. power supply as a source of energy for excitation of plasma. An electrode plate to be processed is located between every two electrode plates in a state of floating. A gas inlet system is provided in order that the aforesaid vacuum pumping and excitation of plasma can cooperatively make uniform distribution of reaction gas in the vacuum chamber to shorten the process flow and the operation time of desmearing in the holes of a printed circuit board and to lower the cost of equipment.