Keyboard scanning circuit, keyboard and its scan method

The disclosure provides a kind of keyboard scanning circuit, keyboard and its scan method.This keyboard scanning circuit includes multiple switch element, M bar scan line, the N bar line of induction.Any bar line of induction has a common node, and arbitrary common node is extended with M transmission lines.Any of which transmission lines with this etc. one of them mutual confluce of scan line be coupled with a switch element, and wantonly two transmission lines in any bar line of induction to be coupled corresponding scan line via the switch element being respectively couple to different.The disclosure can prevent the generation of Ghost Key phenomenon.