Silicon-aluminum alloy is a binary alloy composed of silicon and aluminum. It is an alloy material mainly used in aerospace, space technology and portable electronic devices. Silicon-aluminum alloy material can maintain the excellent performance of silicon and aluminum, and the content of silicon and aluminum is quite abundant. The preparation technology of silicon powder is mature and the cost is low. At the same time, this material has no pollution to the environment and is harmless to the human body. The silicon-aluminum alloy density is between 2.4 and 2.7 g/cm3, and the coefficient of thermal expansion (CTE) is between 7-20 ppm/°C. Increasing the silicon content can significantly reduce the density and coefficient of thermal expansion of the alloy material. At the same time, silicon aluminum alloy also has good thermal conductivity, higher specific strength and stiffness, good plating performance with gold, silver, copper, and nickel, weldability with the substrate, and easy precision machining, etc. Wide application prospects for electronic packaging materials, especially in high-tech fields such as aerospace, space technology and portable electronic devices.