Abstract: A new shape optimization method using boundary element sub region technique is presented in the paper, which is suitable for the shape optimization of mechanical element. Linear boundary element is used to calculate the displacements, tangent stresses on boundary of structure. Sensitivity of displacement, stress is formulated. Formulas of effect matrix and tractions on the internal boundary in detail. A part of boundary of lift arm of a loader is re-designed to minimize the maximum stress on the boundary.

Key words: 构件, 连界元法, 优化