Abstract: By traditional numerical-hydraulic modeling,the nature of numerical-hydraulic model is hardly revealed. This paper makes a new study for the way in which numerical-hydraulic modeling is carried out, choosing up-to-date component programming model in software project to encapsulate numerical-hydraulic model. In such a way,the visualization in numerical-hydraulic modeling process is implemented. On the other hand,the numerical computation is steered according to the feedback information of visualization.