Corrosion of the aluminum alloy drill pipe in the drilling fluid can affect the drilling performance and even cause serious downhole incidents. In order to improve the corrosion resistance of the aluminum alloy drill pipe, the organic corrosion inhibitor (C18H29NaO3S or SDBS) or rare earth corrosion inhibitor (La2(SO4)3) was added at some ratio to the polysulfonate drilling fluid at 10 pH and 70℃, and its effect on the 7075 aluminum alloy drill pipe corrosion was investigated through the mechanical test. The results show that both corrosion inhibitors can reduce aluminum alloy corrosion in alkaline drilling fluids, and improve the tensile strength of aluminum alloy drill pipe by up to 6.73%. The second phase particles of Cu, Mg, Si and other elements in the alloy are the corrosion-sensitive areas. Corrosion pits are formed where the second phase particles have fell off. The corrosion products mainly consist of Al, C, O and other elements.