**1. Introduction**

Polysilane (PS) is a kind of polymers with backbone consisting of only silicon atoms. It arouses great attention for its special electronic and optical properties1, as well as SiC ceramic precursor2. The main method to synthesize polysilane is Wurth coupling reaction which rules out the production of many polysilanes with functional groups for the harsh reaction conditions3. Among the various methods for the synthesis of polysilanes4, the electrosynthesis technique is gaining importance for its mild and safe condition and aptness of making functional molecules5. Shono6 studied the effects of electrode materials, monomer concentration, amount of supplied electricity, and ultrasonic on the synthesis of polysilanes and related polymers. The concerned monomers bear inert side groups, such as methyl, ethyl, butyl, phenyl. The first attempt of attaching reactive vinyl groups to polysilane by electrosynthesis failed7. Our purpose to get high ceramic yield SiC precursor has prompted us searching for ways to introduce cross-linkable groups into polysilane molecules. Using allyl chloride and methyltrichlorosilane(MeSiCl3) as monomers, we managed to synthesize polysilane with double bonds8, an excellent SiC precursor9. To increase the anti-oxidative ablation property of SiC, one way is to adulterate refractory metals M, such as Ti, Zr, Hf, et al., into SiC ceramic10. Coordination of M into polysilane molecule needs ligands. Cyclopentadiene(Cp), which is served as ligand for transitional metals, was attached on PS chains, thus zirconium atom was chemically combined with polysilane chain. And a new route to make composite ceramic MC-SiC was invented.
