Aiming at the problems of poor formability and low mechanical properties of laser additive manufacturing aluminum alloy satellite mounts and the needs of complex configuration and lightweight， taking the satellite flywheel mount as an example， the structural design method of nano-ceramic particles modified aluminum alloy （tau-aluminum） and topology optimization combined with parametric design was proposed. Firstly， through the micro-material scale modification design， the high formability and fine and uniform microstructure of tau-aluminum material is obtained， and the modulus of elasticity， strength and plasticity are significantly improved； secondly， through the topology optimization and parametric design， the flywheel bracket achieves a weight reduction of 55%， and at the same time， through the mechanical simulation analysis， it is proved that the bracket''s stiffness， strength， and enlargement meets the design requirements；finally， the laser additive manufacturing process parameters are adjusted to reduce the defects of ceramic aluminum material and realize the high-quality forming of the designed flywheel bracket. The research results can be popularized and applied to the design and manufacture of more satellite structural components to realize weight reduction and high performance of structural components and improve the development efficiency.