6-layer 2nd order HDI PCB test board, also called 6-layer 2nd order blind buried hole PCB semiconductor test board, is a kind of 2nd order HDI semiconductor test board developed and produced by Shenzhen Dafengwang Electronics Co. The HDI circuit board is made of SangYi S1000-2M substrate, and after the PCB manufacturing process such as laser drilling and surface gold plating, the aperture can reach 0.1mm and the line width/line spacing can reach 75/75um, and the product is widely used in semiconductor test field.