Poly(propylene fumarate) (PPF) is one kind of linear biodegradable polyester and the unsaturated double bonds along its main chain can be crosslinked with other olefinic monomers to form three-dimensional networks,and the networks can support tissues. In the present paper,firstly,the intermediate oligomer-bis(2-hydroxypropyl) fumarate (PFP) was synthesized,and then the unsaturated linear polyester PPF was synthesized with the oligomer PFP through melting condensation process. Additionally,on the base of the process,the oligomer bis(2-hydroxypropyl) sebacate (PSP) was synthesized by similar method and then a kind of new copolymer named poly(propylene fumarate-co-propylene sebacate) [P(PF-co-PS)] that comprised bis(2-hydroxypropyl) sebacate segments was synthesized with PFP and PSP by melting condensation. During the synthesis process,the structures of bis(2-hdroxypropyl) fumarate,bis(2-hydroxypropyl) sebacate,PPF and P(PF-co-PS) were characterized by FTIR. The results shows that with the polymerization going along,oligomer bis(2-hydroxypropyl) fumarate and bis(2-hydroxypropyl) sebacate converted to PPF or P(PF-co-PS) gradually.