Abstract: A method, a device, a server and a system for authenticating the identity with the biological character in an authenticating system, the authenticating system at least includes a local device and an authenticating server, wherein the method comprises the following steps: inputting step, inputting the biological character data in the local device by a biological character sensor; matching step, matching the input biological character data with the original biological character data pre-stored in the memory of the local device; first identification code producing step, producing the first identification code in the local device if the input biological character data is matched with the original biological character data pre-stored in the memory; and authenticating step, sending the first identification code to the authenticating server, authenticating the first identification code by the authenticating server in order to authorize the system to perform the authorized operation.