Uni-directional interactive model only updates the right part<cite> [Álvaro Peris et al., 2016</cite>;<cite> Knowles and Koehn, 2016]</cite> , ignoring potential mistakes in the left part, which means the revised word should always be the left most error, otherwise the errors in the left part will never be corrected. We purpose a sequential bi-directional decoder for interactive NMT, which can update both parts of the sentence.