Organometallic polymers containing Fischer-type aminocarbene moieties in the main chain were prepared for the first time by the polycondensation of a bifunctional alkoxycarbene with diamines. A bifunctional alkoxycarbene with the formula of (CO)(5)W[C(OCH3)-p-C6H4-C(CH3)(2)-p-C6H4-C(OCH3)]-W(CO)(5) gave the polymers by the condensation with hexamethylenediamine, 1,3-propanediamine, ethylenediamine, and p-xylylenediamine in THF at room temperature. The resulting polymers were stable under aerobic conditions and soluble in common organic solvents. The molecular weights of the polymers were estimated to be 2200-8800 by GPC measurements, and the structures of the polymers were characterized by NMR and IR spectroscopies.