Patent ID: 8191244

Claim:
A fabricating method of a circuit board, comprising the following steps: adhering to a liquid material between a first substrate and a second substrate by using an atmospheric pressure difference, the first substrate comprising two first metal layers and a first dielectric layer disposed between the first metal layers, the second substrate comprising two second metal layers and a second dielectric layer disposed between the second metal layers, wherein the liquid material adheres to one of the first metal layers and one of the second metal layers; forming at least one first conductive column connecting to the first metal layers in the first dielectric layer; forming at least one second conductive column connecting to the second metal layers in the second dielectric layer; patterning the first metal layer and second metal layer both without adhered by the liquid material to respectively form a first circuit layer and a second circuit layer; forming a first lamination structure on the first circuit layer, wherein the first lamination structure comprises a third metal layer; forming a second lamination structure on the second circuit layer, wherein the second lamination structure comprises a fourth metal layer; separating the first metal layer and the second metal layer both adhered by the liquid material; and patterning the first metal layer, the second metal layer, the third metal layer and the fourth metal layer after the first metal layer and the second metal layer are separated.