Abstract: A method for forming a frame includes: (1) providing a thermosetting strip-shaped matrix material and a mandrel, and rolling the strip-shaped matrix material onto the mandrel to form a matrix body; (2) cutting the matrix body to form a plurality of preformed bodies, each having a predetermined height H; (3) providing a mold having a core, the shape of the core corresponding to the shape of the frame, and sleeving the preformed body on the core; (4) putting the mold to a hot press device, and hot pressing the preformed body to form the frame; (5) taking out the frame from the mold.