The establishment of dynamic level-area and level-volume is proposed in this paper.Aimed at water difference produced by different water regime changes,using calculus and Thiessen polygons theory,combined with the existing hydrologic(water level) stations quantity and distribution,Poyang Lake basin characteristics and hydrologic characteristics in different periods,the relationship of hydrologic(water level) stations partition table and area,water level and volume of Poyang Lake is studied.The theoretical study and practice of the relationship of Poyang Lake region dynamic level-area and level-volume are made.