Abstract: The digital depth model(DDM) is the core and foundation in the process and applications of chart depths. A method for interpolating DDM considering uncertainty is proposed. The uncertainty of the soundings deriving from the different data sources is calculated, the interpolation model by using the uncertainty in weighting for the soundings is constructed, and the uncertainty of the interpolated depth node is estimated. Experimental results demonstrate that the proposed method has improved the quality of DDM and can estimate the uncertainty of the interpolated depth node.