In order to explore the potential application of poly(glycolic acid) (PGA) instead of poly(lactic acid) (PLA) in the modification of poly(terephthalic acid-butylene adipate) (PBAT), PGA (mass fractions 0~25%) and PBAT were blended by twin-screw melt blending, and the changes of thermal properties, mechanical properties, crystallization properties and barrier properties of the blends were analyzed. The results show that PGA acts as nucleating agent and reinforcing agent in the blend system, which can increase the crystallization temperature, tensile strength and elastic modulus, and decrease the crystallization enthalpy and thermal decomposition temperature. When the content of PGA increases to 25%, the Vicat softening point of the blend system reaches 89.4 ℃ and the hot deformation temperature reaches 41.6 ℃. With the increase of PGA content, the water vapor/oxygen barrier property of the blend system decreases at first and then increased. However, when the content of PGA increases to 25%, the elongation at break of the blend decreases to 221%. Based on the experimental results and related literature, the properties of 25% PGA and 25% PLA modified PBAT were compared. The results show that the mechanical properties and barrier properties of 25% PGA modified PBAT are significantly better than those of 25% PLA modified PBAT, and the degradation rate of M-25 is faster than that of N-25 in 0`90 days, both of which meets the degradation standard of industrial compost.