Absrtact:With the substantial improvement of the performance of electronic countermeasures equip-ment in the aerospace field,modular units with high integration,high power and high heat dissipation have been born,and the heat dissipation mode of structural components has gradually changed from air cooling to liquid cooling.When the internal flow channel of the component is machined by the aluminum alloy vac-uum brazing process,the welding defects cannot be detected by manual visual inspection.Therefore,we ur-gently need to explore a reliable and accurate non-destructive inspect and analysis method to optimize the program setting,parameter selection and fixture design of aluminum alloy liquid-cooled components in the production and processing process,so as to improve and ensure the welding quality inside the welding sur-face of the component.This paper mainly analyzes and compares the two detection technologies of industri-al CT and water-immersed ultrasonic C-scan,and explores the most effective and applicable inspection method for liquid-cooled components in the production process.