A base of a cordless digital telephone set, wherein the base comprises: a control module, a subscriber line interface circuit module, and a Bluetooth module, and the base further comprises a switch module; and the switch module is configured to, when the switch module receives a first control signal that is sent by the control module, connect a communication data output pin of the subscriber line interface circuit module to a communication data input pin of the Bluetooth module, and connect a communication data input pin of the subscriber line interface circuit module to a communication data output pin of the Bluetooth module; and the base of the cordless digital telephone being characterized by that: the switch module comprises a first single pole double throw switch and a second single pole double throw switch; the first single pole double throw switch is configured to, when the first single pole double throw switch and the second single pole double throw switch receive the first control signal that is sent by the control module, be thrown to a first end, wherein the communication data output pin of the subscriber line interface circuit module is connected to the communication data input pin of the Bluetooth module by using the first end of the first single pole double throw switch; and the second single pole double throw switch is configured to, when the first single pole double throw switch and the second single pole double throw switch receive the first control signal that is sent by the control module, be thrown to a first end, wherein the communication data input pin of the subscriber line interface circuit module is connected to the communication data output pin of the Bluetooth module by using the first end of the second single pole double throw switch; and the control module is configured to, when the first single pole double throw switch is thrown to the first end and the second single pole double throw switch is thrown to the first end, provide a clock signal and a frame synchronization signal to the subscriber line interface circuit module and the Bluetooth module. the switch module comprises a first single pole double throw switch and a second single pole double throw switch; the first single pole double throw switch is configured to, when the first single pole double throw switch and the second single pole double throw switch receive the first control signal that is sent by the control module, be thrown to a first end, wherein the communication data output pin of the subscriber line interface circuit module is connected to the communication data input pin of the Bluetooth module by using the first end of the first single pole double throw switch; and the second single pole double throw switch is configured to, when the first single pole double throw switch and the second single pole double throw switch receive the first control signal that is sent by the control module, be thrown to a first end, wherein the communication data input pin of the subscriber line interface circuit module is connected to the communication data output pin of the Bluetooth module by using the first end of the second single pole double throw switch; and the control module is configured to, when the first single pole double throw switch is thrown to the first end and the second single pole double throw switch is thrown to the first end, provide a clock signal and a frame synchronization signal to the subscriber line interface circuit module and the Bluetooth module.