This paper found the model of drought/flood in the region along Yangtze River of Anhui within the period of sun—magnestism, advance the viewpoint of stage and region charater of the period of drought/flood give a method to carefully chosen the period. It is satisfactory that report back on drought/flood for cently one hundred years and report forward on it for 1981 to 1986. It basically tally with the actual situation to have forecastted the grade of drought/flood for 1987。Conclusion of this study value to ...