The invention relates to a method, a device and a system used for controlling the flow of point to point document sharing in the technical field of communication. The device includes a strategy module used for providing a flow control implement strategy for sharing document; a packet filtering module receives a data packet transmitted by a Router, extracts the connection control information to form an information packet and filters the data packet and/or information packet according to the flow control implement strategy; a flow control module used for carrying through flow control on the document sharing according to the analyzed result. The invention provides a flexible control mechanism for the operation business to carry through adjusting on the document sharing part of the total flowfor one side and the other side ensures the equity for a user to use a flow bandwidth to prevent some users from occupying massive bandwidth for a long time at the other side by carrying through dynamic control on the flow of the document sharing action of the user.