Abstract: Liquid chromatography-tandem mass spectrometry (LC-MS) is a promising alternative or complementary method for traditional ligand-binding assays (LBA) in antibody drug bioanalysis. However, issues related to method development, sample preparation, sensitivity and quantitative accuracy need to be addressed. This paper reviews progress in bioanalysis of antibody drugs by LC-MS methods, introduces the principle of the LC-MS method for the analysis of antibody drugs, and describes the challenges faced in quantitative antibody analysis by the LC-MS method. New strategies that can be used to deal with these challenges include:selection of surrogate peptides, purification and enrichment of samples, improvement in enzymatic digest efficiency, enrichment of peptides, and use of low rate LC. We review the application of LC-MS technology in the biological analysis of antibody drugs and discuss the prospect of using the LC-MS method for the analysis of antibody drugs.