Based on the density functional theory (DFT)，using full-potential linearized augmented plane wave and improved local orbital (APW+lo)，the structure and magnetism of the magnetic materials YFe11M (M=Ti，Si etc.) are analyzed and calculated. The possible positions of the substitutional atom M are analyzed. The effect of the substituted atom M on the magnetism of the intermetallic compounds YFe11M is discussed.