Abstract: In order to further improve the self-developed functional structure and application of 3D modeling visualized integrated system of goaf and to realize the data of 3D entity model docking between the system and popular 3D mining software， the data interface function for entity model in integrated system was designed. The functional structure of data interface for entity model in integrated system was developed on the basis of analysis on data structure storage rule of 3dm， dat and dtm files. Practical application showed that the interaction and share of goaf’s 3D entity model between integrated system and other 3D mining software could be achieved effectively， and the input and output functions of model data in integrated system are further improved and its application value is enhanced. Meanwhile， the analysis can provide great reference to further study the format of these three files.

Key words: goaf, visualized integrated system, 3D entity model, interaction interface, data structure