Abstract: According to the basic characteristic of the open pit mine production and the requirement of production plan，some key techniques about the scheduling and the system structure based on 3D visualization were studied.3D database platform was built as the foundation based on 3D visualization modeling and design technology，and the open pit production was decomposed into individual task unit，on which were made the assignment，decomposition and sequencing to generate a variety of schedules through various statistical methods.Finally，the feasibility of this technology and its superior performance were verified through engineering examples.The results showed that the application of 3D visualization technology in mine production schedule planning was reasonable and efficient.The complex production schedule became clear in the 3D environment.It greatly reduces the complexity and difficulty of open pit production scheduling plan，and also plays a certain impetus role in digitized advancement of mine enterprise in our country and owns the significance in practice.

Key words: Visualization, Production plan scheduling, Open pit mine, Task unit