The microstructure of Al-50Si alloy was complex with a large amount of blocky primary crystalline silicon distributed in the aluminum matrix.Due to two-phase anisotropy during drilling，the chips adhesion at the cutting edge were produced，led to acceleratin tool wear.As cutting parameters varied，axial force and drilling temperature changed accordingly， thereby affecting hole quality.To address this challenging material，drilling experiments on Al-50Si alloy using TiAlN， TiCN， and TiN coated carbide drills were conducted.By revealing the variation patterns of axial force under different cutting parameters，identifying wear types on coated tools，and comparing damage levels at hole entry/exit points and wall surfaces，the research evaluated the drilling performance of coated tools and investigated the drilling quality of Al-50Si alloy.The experimental results indicate coated tool surfaces exhibit aluminum matrix adhesion and chipping，with wear mechanisms primarily involving adhesive wear and abrasive wear；drilling axial force F_z is most significantly influenced by feed rate f；the higher tool shear forces correlate with improved hole entry quality；the hole wall quality correlates with tool cutting performance.The defects such as pitting，scratches，chip adhesion，and substrate tearing appear on the machined surface.The hole exit quality is most affected by drilling axial force F_z，with higher axial force F_z resulting in poorer exit quality.TiAlN-coated tools achieve optimal drilling quality at a cutting speed v of 70 m/min and a feed rate f of 0.05 mm/r.