The methods of establishing ring bonds finite element model——detailed model and equivalent stiffness model are elaborated in order to research the effect of systems with adhesive. Uniform changing temperature load cases are analyzed through the equivalent stiffness model, and then the results from FEA is compared to the actual tests. Some of factors which affect surface figure errors such as Poisson’s ratio of adhesive, bonded position, bonds width, bonds thickness etc., are analyzed for optimal design. Choosing an optimal project, the dimension stability of the focusing mirror component is fully analyzed. Besides eccentricity bonds caused by inaccurate bonding process are also researched within the same model. The analysis result shows that the properties of ring bonds can be properly represented by equivalent stiffness model. The optimal design can meet the tolerance demand, and avoid the influence induced by eccentricity bonds.