Abstract: The relationship between ore-rock location and structural occurrence of engineering rock mass is often characterized by complexity and randomness. Two-dimensional expressions commonly used have certain abstraction and limitations in expressing spatial relations. The visual performance of three-dimensional digital model makes up for the shortcomings of two-dimensional drawings. However， due to its limitation on memory capacity and display platform， the widely-used three-dimensional model limits its application scope. Taking Dagushan Open-pit Iron Mine as a case， the three-dimensional visualization of Dagushan Open-pit Iron Mine has been realized and successfully published to the computer based on Unity 3D platform. At the same time， considering its convenience in application， the three-dimensional model is published in the form of APK as the application program of mobile phone （APP）. In addition， the interactive data transmission among computer， mobile client and cloud server can be realized， and dynamic data can be updated in real time.

Key words: 3D visualization, Mobile application, Cloud server, Data transmission, Unity 3D