The invention relates to a method of implementing online transaction in a graphic database. The method comprises the steps of: (1) creating an on-line transaction; (2) performing on-line transaction data operation; and (3) submitting the on-line transaction: marking the submission status of the transaction; reading the relevant node name in an associate_node column of the record and sequentially processing dirty data related to the transaction in the corresponding node; and deleting the record in DataSet corresponding to the transaction. The steps are ended if the submission of the online transaction is successful, otherwise, the on-line transaction is rolled back. The invention has the advantage that the online transaction is identified with a 'transaction ID (identifier)' and is free from the connection limitation of a called client-side program, and the same transaction can be shared among multiple client sides, therefore the distributed transaction is conveniently realized.