Provided is a method for obtaining high-yield, stable-expression cell clones from myeloma cell lines in a protein-free culture medium. The method is used for industrial production of a recombined antibody, and includes three stages: (1) adapting to a protein-free culture medium, statically culturing cells at a low density, and gradually reducing a fat-rich supplement to a chemical culture medium (2) adapting to the protein-free culture medium: culturing cells at a high density, and using a perfusion fermentation system in a laboratory scale and (3) screening high-yield, stable expression cell clones from the cells after fermentation ends. The cell clone may be used to produce a humanized anti-NeuGcGM3 14F7h-recombined antibody.
