The polysilanes containing chlorine were synthesized by the substitution reactions using polymethylphenylsilane and acetyl chloride

anhydride or ester as reactants in the presence of anhydrous AICl3. The acetyl chloride can lead a nearly complete substitution of phenyl groups with chlorine on silicon atoms．The monobasic anhydrides (acetic and propionic anhydrides) can introduce some acyloxy groups to the polymer

while more phenyl groups were still replaced by Cl．The maleic and o-phthalic anhydrides and CH3COOC2H5 only lead to partly chlorinesubstituted polysilanes．The possible reaction mechanisms were suggested

and the influence factors on the reactions were discussed．The UV and fluorescence characters of these polysilanes were studied as well．