Abstract: In order to solve the question of indirect displaying of traditional mathematical model, a planar 2-D visualization model and dynamic display system is established by the mixed programming languages of FORTRAN and VB，VC. It can provide visualization during the whole calculation progress, and can give 2-d and 3-D displaying and dynamic demonstration. It has been carried out successfully on the north and south river reach of the estuary of the Yangtze River. Results show that the window is clear-cut, operation convenient, displaying direct, and function powerful. So it improves the efficiency of solving project problems with mathematical model greatly.