Abstract: Research on optimization of stage height plan in mining deposit is one of the tasks that have a direct relationship to the safety reliability and management benefit in mining production.Taking a development system of some gently inclined multilayer deposits as foundation，a 3D development system model was built first by using the 3D visualization technology of 3DMine mining software to realize the 3D visualization of the underground mining engineering of the complex multilayer deposits；Secondly，the stage development engineering entity model was built based on a CAD design，with the functions of multi-dimensional visualization of middle-section developing engineering，calculation of the mining capacity，and computation of the engineering quantities.And the models' dynamic section and transparency were shown as well；Lastly，the stage height optimizing plan with minimum unit stage quantities was taken to optimize the four alternative plans.The optimized plan is consistent with the actual mining，which verifies that the 3D visualization optimization of stage height is reliable and practicable.

Key words: 3DMine, Gently inclined multilayer deposits, Stage height, Optimization plan