To minimize the effects of artificially chosen variables on optimization results,simultaneous topology and shape optimization( STSO) method was proposed for structural optimization of aero-engine disk at the conceptual design phase. This method was based on solid isotropic material with penalization( SIMP)method,by analyzing the sensitivities of the optimized object and constraints,sequential quadratic programming( SQP) optimized method was used to solve the problem. Then,taking shell structure for instant,...