This paper elaborated the design and realization of the track layout editor TOPOLOGY. The software was based on the object-oriented programming and adopted the design concept of icons separated from the devices. With strict data structure design, integrate and consistency checking algorithm and route auto-generate algorithm were all used in the software. The integrated editing function of track layout editor was realized, and the accuracy and safety of data were ensured, which met the requirement of design and application in urban rail transit signaling systerm well.