The interaction between sodium dodecyl sulfate (SDS) and the nonionic water-soluble polymer poly(ethylene glycol) (PEG) with electrolytes has been Studied by viscosity and Surface tension measurements at different temperatures, (298.15, 308.15, and 318.15) K. The experimental results showed that the Critical aggregation concentration (CAC) value of SIDS + (1, 3, and 5) g.kg(-1) PEG with NaOH is lower than the critical micelle concentration (CIVIC) of SIDS and that the PEG concentration has little effect on this value. When the SIDS concentration is below the CAC, the viscosity of the SDS + PEG solutions with NaOH decreases with increasing SDS concentration, and the minimum viscosity of SDS + PEG complexes at the binding site confirmed the contraction of the polymer chain and the formation of a more compact structure. When the SDS concentration is above the CAC, the viscosity increases with increasing SIDS concentration, indicating that the PEG chains are extended. The surface tension decreases remarkably with increasing SDS concentration, when the SDS concentration is below the CAC, and decreases with increasing temperature. The SDS concentration of the first minimum surface tension corresponds to the CAC of surfactant-polymer-electrolyte solutions. The values of the Gibbs energy change for the transfer of Free micelle to polymer-bound micelle were calculated and showed that the addition of NaOH to the SDS-PEG system leads to a decrease of the binding site and an increase in the value of CAC; that is to say, the electroviscosity effect and the interaction strength is decreased.