Abstract: In the electronic system, it occasionally needs to accomplish the simultaneous transmission and reception of signal in the same platform. In the circumstance of simultaneous transmission and reception, strong coupling interference signal need shorter data and higher cancellation effectiveness, while the cancellation effectiveness of normal cause and result canceler is poor. The technology of using non-causal filter to realize digital cancellation is proposed in the theme. The model of non-causal filter digital cancellation is built at first, then the digital cancellation is simulated analysis. With simulation approach proposed, the digital cancellation have advantages, in the circumstance of same filter degree, non-causal filter digital cancellation has better cancellation effectiveness.