Abstract: Nowadays, the capacity of the network seriously suffers from the interference with the users increasing. To deal with this problem, the interference alignment is provided to improve the system capability, though the wireless resource is limited. The basic idea of it is to structural multiple interference overlapped at the receiver and compression occupied resource of interference. In this paper, several related topics are discussed, e.g., signal space alignment, channel time slot alignment and signal scale alignment. The corresponding enhanced methods are sequently introduced such as feedback, relay, partition and admission. Finally, some measures are given to test the performances of the interference alignment. And the analysis results are also shown with the comparison among these methods.