With the broad application of electronic navigational chart (ENC) in inland shipping，the problem of updating of the waterway element data turns more prominent.Based on the analysis of domestic and foreign ENC data update technology，this paper researches the update method for the Changjiang ENC bathymetric elements，navigation elements and other elements，and the data processing algorithm involved in the update process.It also builds all kinds of factors of waterway element updating model.At last，the paper concludes the dynamic update scheme based on the Changjiang ENC production system platform.