Abstract: A package substrate includes a substrate body and a plurality of unit regions disposed on the substrate body. The unit region includes two first solder ball structures. The first solder ball structure includes six first solder balls. The six first solder balls are arranged, with two of them in a row, to form three parallel rows of two solder balls: a first row of solder balls, a second row of solder balls, and a third row of solder balls. Four first solder balls in the first row of solder balls and the second row of solder balls are respectively located at four vertices of one parallelogram, and four first solder balls in the second row of solder balls and the third row of solder balls are respectively located at four vertices of the other parallelogram, and the two parallelograms are arranged axisymmetric about the second row of solder balls.