The formation of complex between PGA and PPAm in aqueous solution through hydrogen bonding was studied by observing the reduced viscosity with different pH, concentration, mole ratio and temperature. The conformational change of PGA in PGA/PAAm complex system was observed by circular dichroism spectrometer (CD). Phase separation took place at high concentration due to the formation of complex between PGA and PAAm. The fraction of coacervate has been interferometrically analysed by refractometer. Also, the effect of urea on PGA/PAAm complex was examined by the change of transmittance. Based on the observation above, it was found that the PGA/PAAm complex was resulted from hydrogen bonding between PGA and PAAm and more stable complex was stochiometrically formed under higher concentration at lower temperature and pH.