An analytical equation of state based on the Yukawa potential is extended to chainlike fluids by use of the renormalization-group (RG) theory. The vapor-liquid equilibria and critical properties for both the spherical and chainlike nonpolar fluids are investigated. The average relative deviations for T, p, and p,, obtained by RG correction are 0.5%, 1.7%, and 0.9%, respectively. Results show that the RG theory used in this paper is applicable to the vapor-liquid equilibria from the low temperature up to the critical region.