Disclosed is SARS-CoV-specific B-cell epitope and applications thereof. The epitopes are peptides and can either be expressed in phages or synthesized to diagnose SARS patients accurately. High sensitivity and specificity of the serologic detection are achievable by using a plurality of SARS-CoV-specific B-cell epitope-based peptides. Therefore, the peptides can be applied to SARS diagnosis and have potentials to be immunogens for producing antibodies against SARS.