Abstract: Chemical milling test of 2524-T3 aluminum alloy sheet was carried out. The surface morphology, tensile properties and fatigue properties of the sheet before and after chemical milling were studied. The results show that before chemical milling, the coarse second phase particles AlCuMg and oxides with size of 5-10 μm existed on surface of the sheet. After chemical milling, a large number of shallow corrosion pits with diameter of 10-50 μm, and micro-holes formed by stripped of the matrix after the second phase particles dissolving and stripping appeared on the surface resulting in the increase of surface roughness. Chemical milling had no significant effect on the room temperature tensile properties of sheet. The yield strength and tensile strength before and after chemical milling were not less than 330 MPa and 460 MPa, respectively, and the elongation percentage after fracture were kept above 20%. The fatigue strength of the sheet before and after chemical milling were 153.5 MPa and 138.3 MPa, respectively, and the fatigue strength of sheet after chemical milling was 9.9% lower than that before chemical milling.