Abstract: The development of the total control management and in teractive user interface is discussed in the paper, taking the Yangtze River Flood Control Decision Support System (YRFCDSS) for an example. The content of the total control management and the technique of software integration between it and other subsystems are first in troduced, and the solution of technique nodus is presented. The processing means of the space and at tribute data based on the technolory of GIS is described, and the design and development method of the interactive user interface based on the GUI is discussed. Finally, the graphics processing and graphics oriented operation based on the electronical map are discussed in detail.