Method for fabricating electrical connection structure of circuit board

A method for fabricating an electrical connection structure of a circuit board, comprising the steps of:

• providing a circuit board having a circuit layer thereon, applying an insulating layer on a surface of the circuit board wherein the insulating layer is formed with a plurality of openings for exposing portions of the circuit layer, forming a conductive layer on a surface of the insulating layer and in the openings of the insulating layer, and applying a patterned first resist layer on the conductive layer to expose portions of the conductive layer, so as to form a plurality of conductive pads and conductive circuits on the conductive layer by an electroplating process and allow the conductive pads to be connected to the portions of the circuit layer;
• applying a second resist layer on the circuit board and forming a plurality of openings in the second resist layer to expose the conductive pads;
• successively forming a first conductive material and a second conductive material on each of the conductive pads by the electroplating process;
• removing the first and second resist layers and a part of the conductive layer covered by the first resist layer on the circuit board;
• applying a protective layer on the surface of the circuit board to cover the first and second conductive materials on each of the conductive pads;
• and
• thinning the protective layer to expose the second conductive material corresponding in position to each of the conductive pads.