Some methods have been developed to use CO2 as the raw material to produce degradable polymeric materials．The terpolymer of carbonate(PPGC) synthesized with the terpulymerization of CO2

pmpylene oxide and γ-butyrolaetone(GBL)．GBL offered an ester structural unit making the eopolymer easier to hydrolyze．Hence

PPCG should be of good degradability．In order to study its degradability

the polymer PPCG was used as materials for drag loading．The drug-loaded mierospheres were obtained by the W/O/W type emulsions method．The mierespheres were spherical in shape with smooth surfaces and good dispersion．The drug loading and encapsulation efficiency were 36.7％ and 78.6％。respectively．The degradative behave was studied by SEM

XRD arid dmg release carves in different degradation medium were obtained．It was found that these microspheres could be degraded at faster speed in the basic media

while could not be degraded in the acidic media．The higher pH value of the medium was

the fasterthe initial degradative speed was．