acid-butanediol urea) copolymer was prepared by melt phase polycondensation and chain extension reaction with succinic acid, adipic acid, 1,4-butanediol and urea as raw materials, under an atmosphere of argon gas through high temperature melt reaction. Then the copolymer film was prepared through rolling film-forming method. The structure and properties of copolymer films were identified and tested by infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), differential scanning calorimetry (DSC) and universal tensile machine. The results showed that, with the increase of adipic acid content, the melting point, crystallinity and crystallization temperature of polymer film decreased obviously. Under the condition of n(SA):n(AA)=1:1, most part of copolymer was the amorphous region with the crystallization performance being reduced greatly, hydrolysis rate being the fastest and the degradation property of copolymer film being the best. The properties of copolymer films could be controlled effectively in thermodynamic property, mechanical property and degradation property by adjusting the ratio of adipic acid and succinic acid.