Date center network flow migration method and system thereof

A data center network flow migration method includes detecting a utilized loading value in each switch of a plurality of switches in the data center network by a controller according to topology information of the data center network. The controller re-establishes a plurality of link paths corresponding to the plurality of switches in the data center network according to the utilized loading value in each switch and a disjoint edge node divided spanning tree algorithm. In these re-established link paths corresponding to the plurality of switches in the data center network, if the utilized loading value of at least one link path is greater than a threshold value, the at least one link paths with the utilized loading value greater than the threshold value is rerouted by a controller according to a flow migration algorithm.