Abstract: This paper describes the square beam of thin wall which is made of high modulus graphite fiber reinforcer M40 of Toray Ind co ltd, and epoxy 648/BF_3—MEA matrix, and which is made by procedures of filament winding, unidire—ctional prepreg stacking reinforcing, and modelling with autoclave cures, reloasing moulding and cutting repairing ect. After researched production Was teseted its properties are stable and reliable. This technigue of production can be utilized in real productions, and the results is satisfactory.