The campus of Northeast Forestry University is huge. For freshmen, a navigation system that can find the shortest path by itself is very practical. Based on the classic dijkstra algorithm to calculate the minimum path problem, combined with the combination of splitting the roads and buildings in the school map into lists and dictionaries in python, a relatively complete map navigation system can be constructed. In addition, the use of Python's own database tkinter to create a graphical interface can make users more convenient to use the navigation system.