Abstract: To improve the full-life-cycle safety monitoring and risk pre-control capabilities of dam structures and solve the problem that traditional simulation is difficult to cover multi-temporal and multi-condition linked deduction, this paper proposes a method for constructing a multi-temporal dam structure simulation and pre-performance system based on digital twin technology. This method integrates historical dam monitoring data and finite element models, builds a technical route of "boundary conditions—finite element calculation—result storage—3D display", designs the file format and storage structure for multi-temporal working conditions, and establishes a temporal mapping relationship among three types of working conditions: historical inversion, current actual measurement, and future pre-performance. Relying on this method, the automatic calculation of actual dam working conditions.