Large high-power solid-state laser facilities have a very high requirement for the total positioning error budget

which is within 50 microns (祄) in general. The stability budget allocated to one optical element is only several microns or microradians (祌ad). For some optical elements

the budget is even smaller than 1祌ad. Thus the requirement for stability of structures is high. The stability design is illustrated for several key optical and mechanical systems in a large laser facility. Using the finite element theory

stability due to ambient vibration is analyzed for key optical elements and support structures to verify the validity of the optical and mechanical systems. The finite element (FE) models are built for the systems. The results show that the optical elements and the support structures can satisfy the designed stability indices and all the design margins are greater than 1.5 which is very conservative based on NIF?s research.