Data photocopying method and system in IMS (IP multimedia subsystem) database online transaction

The invention discloses a data photocopying method and system in an IMS (IP multimedia subsystem) database online transaction. The method comprises the following steps of: initiating a first transaction to a host from an open platform by an open terminal, obtaining database data of a host hierarchical database used by the first transaction by monitoring a database interface, and storing the obtained database data in a host transaction data storage file, and storing the stored database data in a relation database on the open platform in a search format; when the open terminal determines to initiate a second transaction the same with the first transaction, obtaining the database data used by the first transaction from the relation database, and uploading to the host photocopying data storage file, generating a DL/1 (data link) operation sequence executed on the host hierarchical database according to the database data of the first transaction, orderly reading the DL/1 operation in the DL/1 operation sequence, and executing the relative data photocopying operation according to the DL/1 operation sequence, thereby realizing the data synchronization in the transaction; and the involved data quantity is small and the resource cost is low.