A mainframe-based far-distance bicentric transaction information processing system, providing a processing operation solution. The method includes: receiving upload transaction information containing transaction type data; searching transaction information requiring an amount of shared resource less than a preset threshold when being processed, according to the transaction type data; and transmitting the transaction information requiring the amount of shared resource less than the preset threshold when being processed, to a backup processing center to be processed, when CPU utilization rates exceeds a preset safety threshold. The system includes a main processing center and a backup processing center. The transaction information processing method and system implement the mainframe parallel sysplex far-distance bicentric transaction processing including the main processing center and the backup processing center, which expands the physical distance between the two centers, improves the processing capability and reliability of the transaction system, and sufficiently utilizes the resources of the backup processing center.