Pupa protein viscose filament yarn is a new kind of composition fiber spins from mixed silkworm pupa protein and viscose dope and of skincore structure. It colligates the advantages of natural silk and viscose rayon. It contains eighteen kinds of amino acid in which seven are close to human skin, which bring it very good affinity and help it to be homologated as high-tech product by "torch center group" of national science and technology department. It is an ideal material for making slap-up underwear, T-shirt, spring and summer clothes and plus material.