Abstract: To resolve the time-space conflicts in pouring concrete of high arch dams, this paper first analyzes the state transition of construction entities in a three-dimensional space, and develops a spatial-temporal evolution model and description method of the entities. Then, by the transition process, generation and classification of the conflicts and their effect are examined and a mechanism of space-time adjustment to the pouring procedure is established. Finally, a conflict detection mechanism is constructed using simulations of concrete pouring. We have achieved simulations of the pouring procedure in the virtual scene and developed an optimization model for dynamically adjusting the construction scheme. Application to a practical case of concrete pouring shows that this method can provide detailed data for a pouring procedure before its implementation and hence it would help analyze the feasibility and security of a construction scheme.