Based on the overall analysis of roller compaction system of high core rock-fill dam, the theory of construction simulation for roller compaction is put forward and the simulation model is set up which can actually reflect the uncertainties of the rock-fill dam roller compaction to ensure the simulation to be more close to the actual construction. This study achievement has been applied to the filling unit construction process of the Nuozhadu high core rock-fill dam to verify the reliability of the simulation model, which gives important guidance to the project. Meanwhile , the technical support is applied for the schedule control and management.