Abstract: The dynamic electronic map has the functions of post-displaying the past changes, real-time tracing the changes being happened, predicting the changes to be happened and virtual simulating the changes not actually existing. The design of this kind of electronic map has to consider the properties to determine the background layer in a dynamic way, to utilize the temporal scale and temporal generalization, to extend symbol parameters into time related domain, to visualize the change information by multi-scale representation, and to consider the interactive action to control change phenomena. Based on the development experiences, this paper presents the design principles and methods about the aspects above in detail. An example is investigated to design an inland chart to moniter the position and working status of buoys.