In order to obtain the structure type of turbine disk satisfying minimum masses and stress standards

the influence of multiarcs transition on stress distribution at key parts was studied. Doublearcs and threearcs structure design schemes were proposed

and geometric theory on arcs transition was derived to support the design modifications and optimization. Based on finite element calculation

the stress varying with structure parameters was obtained. Based on ANSYS Workbench platform and parametric modeling technique

optimization design variables were chosen to get minimum masses with constrained equivalent stress. Result showed that

the maximum equivalent stress on two parts decreased by 662% and 1140%

the mass of turbine disk decreased by 016%. The results provide useful references for multiarcs design and engineering applications of the gas turbine disk.