Abstract: Based on the platform of windows the drought/flood monitoring and graphic system is programmed with the languages of Borland C and Foxpro. All functions are controlled by pull-down and pop-up Chinese menu, and the operational interface is friendly. The software structure of the system is flexible and reasonable. The historical database including dekad to dekad precipitation, temperature and drought/flood grade is set up. The system has the functions of collecting and retrieving drought/flood information, and tabling and analyzing graphics. The system assumes the function of real-time and effective monitoring the occurrence and development of drought/flood, and could provide a scientific basis for the government to make decision and measures of preventing drought/flood disasters.