In this work a new prodrug polymer was prepared with two attachment groups (amid ester), using di functional spacer such as ethanol amine, which could react with polyacrylic acid producing amide group, with remain ethanol terminal group which could react with captopril acyl chloride, producing ester group with extended the arm substituted drug to improve the hydrolysis and to prevent the steric effect of polymer chains. Many advantages enhanced the prodrug of polymer. The prepared polymers were characterized by FTIR, 1H NMR spectroscopies. Controlled drug release was studied in different pH values at 37℃, using UV. Spectra with comparing with calibration curve. The modification percentage test was studied, and swelling percentage was calculated and all physical properties were observed.