A six-member cyclic carbonate with protected functional groups was synthesized from tetramethylolmethane,benzaldehyde and ethyl choroformate.Coplymerization of（D,L-lactide） with cyclic carbonate was carried out through conventional ring-opening polymerization using Sn（Oct）2 as the catalyst.The effects of different catalysts,polymerization time and monomer-to-catalyst molar ratio on the molecular weight were investigated.The methods of removing protected groups were studied.Results showed the protected groups were effectively removed via catalytic hydrogenation.（Poly（D,L-lactide-co-cycliccarbonate）s） with hydroxyl pendant functional groups was obtained.
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