Abstract: A physical unclonable function (PUF) circuit structure is provided, which comprises: n passive conductor groups and n XOR units, where each of the n passive conductor groups comprises m passive conductors, each of the m passive conductors comprises a first terminal connected to a power supply and a second terminal connected to an input terminal of a corresponding XOR unit of the n XOR units; and the second terminals of passive conductors within the same passive conductor group are connected to an input terminal of the corresponding XOR unit. In the circuit structure, the connection randomness of the passive conductors is achieved by using a different widths and/or different spaces of the passive conductors, and then a PUF function can be realized.