A method and a system for synchronizing functions of a music player in a smart device and a Bluetooth earphone are disclosed. The method includes: transmitting a first play list to a smart device by a Bluetooth earphone; comparing the received first play list with a second play list by the smart device; receiving and transmitting a first control instruction to the smart device by the Bluetooth earphone when the first play list is consistent with the second play list; and transmitting the second play list to the Bluetooth earphone, and receiving and transmitting a second control instruction to the smart device by the Bluetooth earphone, when the first play list is inconsistent with the second play list.