The invention discloses a method and a system for accelerating short flow of data centers on the basis of redundancy techniques. The method includes steps of periodically operating a redundancy flow number distributing module; distributing redundancy flow numbers for the short flow of application programs and acquiring source port number sets by the aid of path collision avoidance processes to create original flow and redundancy flow. Paths of the source port number sets are not overlapped with one another, and the numbers of the created redundancy flow correspond to the numbers of the original flow. The system comprises the redundancy flow number distributing module, a path collision avoidance module, a database and a main module. The redundancy flow number distributing module is responsible for selecting the numbers of the redundancy flow, the path collision avoidance module is responsible for avoiding overlapping of paths of the original flow and the paths of the redundancy flow, the main module is used for providing TCP (transmission control protocol) flow calling interfaces for the application programs and calling the path collision avoidance module according to the numbers of the redundancy flow, so that the source port number sets can be acquired, the paths of the source port number sets are not overlapped with one another, the original flow and the redundancy flow can be created, and the numbers of the redundancy flow correspond to the numbers of the original flow. The method and the system have the advantages that overlapping of the paths of the original flow and the paths of the redundancy flow can be prevented, the different numbers of redundancy flow can be distributed to the short flow with different sizes, equivalent paths can be reasonably utilized, and the system is high in efficiency, easy to deploy and low in load.