The embodiment of the invention discloses a method, a system and a device for synchronous processing. The method comprises the following steps: receiving a first synchronous request, wherein the first synchronous request comprises a Filter, and the Filter is used for limiting data needing synchronization; recoding a correlation parameter of the Filter in the first synchronous request; and synchronizing the data according to the correlation parameter of the Filter. The system comprises a client terminal and a server. The client terminal and the server send the correlation parameter of the Filter while synchronizing the data, and the server receives and records the correlation parameter of the Filter or informs the client terminal to record the correlation parameter of the Filter. When synchronization fails or resynchronization is needed under the condition that synchronization reaches a breaking point, the client terminal or the server obtains the recorded correlation parameter of the Filter to carry out synchronous operation, thereby being capable of reducing the quantity during synchronous operation and shortening the synchronous time.