Polycarbosilane and pitch are the precursors of SiC fiber and carbon fiber Separately. They can be blended into a precursor of a new type of SiC-C fiber. The spinningability of this precursor is related to the properties of poly carbosilane and pitch. So ling as spinningability temperature regions of polycarbosilane and pitch cross each other，there can be a good spinning PC-P blender. It is valuable to the selection of components and blending process.