A computer-implement method for exchanging data between a blockchain system and a non-blockchain system is provided. The method includes: adding, by endorser nodes, periodically a plurality of status information of the endorser nodes to a smart contract of a blockchain ledger; receiving, by a first peer node, a transaction from an application; sending, by the first peer node, the received transaction to all endorser nodes; processing, by the endorser nodes, the transaction via the smart contract to obtain a plurality of endorsements; electing, by the endorser nodes, one of the endorser nodes as a target endorser node according to the status information of the endorser nodes; and transferring, by the target endorser node, the endorsed transaction to the non-blockchain system via an API corresponding to the non-blockchain system.