a new method was developed for the composition quantitative determination of heavy alkylbenzene sulfonate(HABS) in surfactant complex systems. The absorption spectra of HABS showed the presence of β-cyclodextrin (β-CD) could result in the enhancement of absorption intensities of HABS. The results indicated that the determination precision of HABS can be significantly improved by β-CD, and the effect of several common interfering substances (SDS,OP-10,HPAM,Cl^-,Na⁺,Ca²⁺,etc.) on determination of HABS in β-CD aqueous solution can be greatly reduced. Based on this, the maximum errors of the determined HABS are less than 2.2% under multifactor interferences, and the precision of the method is as high as 10^-2~10^-3 mg/L. In general, synergistic effect of these interference factors could not formed by the excited UV absorption spectrometry.