Abstract: Polyester polyurethane elastomers (PUEs) were synthesized using glutarate epoxycyclohexane diglycol (GCHD), modified polybutylene adipate (PBCHA) as the soft segment (SS), and dicyclohexylmethane diisocyanate (HMDI) as the hard segment (HS). The effects of HMDI, glutarate GCHD, and catalyst addition on the thermal stability and mechanical properties of PUE were studied by FTIR, TG, DSC, tensile performance test, elongation at break test, etc. The results show that with the increase of HMDI mass fraction and GCHD molar fraction, the tensile strength first increases and then decreases, in which the mass fraction of HMDI is 21%, the molar fraction of GCHD is 4%, the tensile strength reaches the maximum of 16.44 Mpa, and the elongation at break decreases. The elongation at break decreased with the increase of modifier content, and the optimal elongation at break was 2337.38%.The elongation at break decreased with the increase of modifier content, and the optimal elongation at break was 2337.38%. With the increase of HMDI mass fraction, the highest thermal decomposition temperature of T10%, T50% and Tmax reached 362.65 °C, the highest T50% thermal decomposition temperature was 372.69 °C, and Tmax was 405.95 °C.