Abstract: Combining with the features of the embedded system，the structure of the embedded digital map based on VxWorks is provided.By using the software timer ISR（Interrupt Service Routine） and the periodic signal scheduling table，a technique is provided to manage the periodic signals.A task manager is provided to scheduling all the interrupts and the tasks.The data structure of the embedded digital map and the mechanism of exchanging map data are established to draw the map with the data from the shape file.An instance of the embedded digital map is provided to show the feasibility of this technique.