A rapid and simple antibody anal. method based on HTRF technol. was established to measure concentration of recombinant monoclonal antibody in both cell culture medium and purified antibody solutionAPC-labeled antigen, antibody samples or controls, and Eu-labeled anti-human IgG were added into 96 well plate (Black), incubate for some time, followed by fluorescence reading with microplate reader.Standard curve was generated by 4-PL model, antibody concentration in tested samples was calculated accordingly by software.The method qualification results showed that the method was antigen-antibody specific, with accuracy close to 98.9%, precision close to 4.3%, and linearity range 25-1000 ng/mL.This method can be used for cell line screening, bio-process monitoring, and quality control during antibody drug development.