A method for data transmission, applied at a first Bluetooth end, comprising: establishing (102, 503) a point-to-point connection with a second Bluetooth end; acquiring (103, 504) identity information of the second Bluetooth end through the point-to-point connection; and sending (104, 507) broadcast isochronous group information BIGInfo to the second Bluetooth end through the point-to-point connection when the identity information of the second Bluetooth end is verified, to enable the second Bluetooth end to receive a data stream of a broadcast isochronous group BIG sent by the first Bluetooth end according to the BIGInfo; wherein sending the BIGInfo to the second Bluetooth end through the point-to-point connection comprises: sending the BIGInfo of the BIG corresponding to the identity information of the second Bluetooth end to the second Bluetooth end through the point-to-point connection according to a pre-stored correspondence between the identity information and the BIG; wherein the identity information is configured to characterize a type of the second Bluetooth end; and wherein the BIGInfo is encrypted by a first key, and the first key is generated by the first Bluetooth end in real time based on a preset encryption method with reference to the identity information of the second Bluetooth end and identity information of the first Bluetooth end. establishing (102, 503) a point-to-point connection with a second Bluetooth end; acquiring (103, 504) identity information of the second Bluetooth end through the point-to-point connection; and sending (104, 507) broadcast isochronous group information BIGInfo to the second Bluetooth end through the point-to-point connection when the identity information of the second Bluetooth end is verified, to enable the second Bluetooth end to receive a data stream of a broadcast isochronous group BIG sent by the first Bluetooth end according to the BIGInfo; wherein sending the BIGInfo to the second Bluetooth end through the point-to-point connection comprises: sending the BIGInfo of the BIG corresponding to the identity information of the second Bluetooth end to the second Bluetooth end through the point-to-point connection according to a pre-stored correspondence between the identity information and the BIG; wherein the identity information is configured to characterize a type of the second Bluetooth end; and wherein the BIGInfo is encrypted by a first key, and the first key is generated by the first Bluetooth end in real time based on a preset encryption method with reference to the identity information of the second Bluetooth end and identity information of the first Bluetooth end. sending the BIGInfo of the BIG corresponding to the identity information of the second Bluetooth end to the second Bluetooth end through the point-to-point connection according to a pre-stored correspondence between the identity information and the BIG; wherein the identity information is configured to characterize a type of the second Bluetooth end; and wherein the BIGInfo is encrypted by a first key, and the first key is generated by the first Bluetooth end in real time based on a preset encryption method with reference to the identity information of the second Bluetooth end and identity information of the first Bluetooth end.