1. A system for processing long relation chain data of a user, comprising: a cache module, a receiving module and a saving module, the cache module being disposed in memory and configured to: respond to an operation request, from a front end, for the long relation chain data of the user, and synchronously send a modification request in the operation request to the receiving module; the receiving module being configured to receive the modification request from the cache module, and synchronously store the modification request into an operation log file of a non-memory storage device; and the saving module being configured to read the modification request in the operation log file of the receiving module, and modify the long relation chain data in a database (DB) according to the read modification request.