Abstract: A function chip enabling method and a chip using the same. The function circuit enabling method is applicable to a chip including a function circuit, and includes steps of: receiving an enabling code, performing an operation on the enabling code according to a first key of a non-symmetric operation to generate a decrypted enabling code; comparing the decrypted enabling code with a predetermined enabling code to generate an enable signal to enable the function circuit. A second key corresponding to the first key of the non-symmetric operation is not stored in the chip.