The rheological properties（zero-shear viscosities）of aqueous solutions containing partially hydrolyzed polyacrylamide （HPAM）and poly（vinyl alcohol）（PVA）were investigated by creep tests at a total mass fraction of 0.20%，and the effect of the mass fraction of HPAM in the two polymers（RPH）and electrolyte（NaCl）concentrations（cNaCl）on the rheological properties was discussed. The interaction mechanism between HPAM and PVA was probed. The results showed that the interpolymer complex could form between HPAM and PVA via hydrogen bonds，and the PVA/HPAM complex molar ratio was about 90. At 0 0.7，no obvious viscosity effect was observed. The presence of NaCl could lead to a“viscosity increase effect”for PVA/HPAM mixed solution（RPH=0.20），suggesting that the mixing of PVA with HPAM could enhance the salt resistance of HPAM solutions. This work deepened the understanding of interpolymer interaction behavior and provided important information for the application of HPAM-based composites in the enhanced oil recovery.