This paper takes Al-50wt%Si high-silicon aluminum alloy as the research object， and adopts single factor test method to carry out dry milling test of uncoated carbide tools to analyze the influence of cutting parameters on tool wear and surface roughness. The results show that the surface roughness is most significantly affected by the feed per tooth， and increases with the increase in the feed per tooth. When the feed per tooth increases from 0.07 mm/z to 0.16 mm/z， the surface roughness increased by 2 times； tool wear is most significantly affected by cutting speed， and increases with the increase of cutting speed. When the cutting speed increases from 140 m/min to 260 m/min， the total cutting length decreases by 3 times， but the wear on the flank of the tool is only 0.8 times that at a speed of 260 m/min； the surface roughness increases first and then decreases with the increase of tool wear. The cutting length increases from 350 mm to 1750 mm， the tool wear increases by 4.5 times on average，while the surface roughness decreases by 2 times； the main wear forms of cemented carbide tools are： abrasive wear and chipping.