The stability constants for the inclusion complexes between carboxymethyl-$eta$-cyclodextrin (CM-$eta$-CD) and five $eta$-blockers, such as atenolol (ATE), bisoprolol (BIS), metoprolol (MET), pindolol (PIN) and propranolol (PRO) were determined by capillary electrophoresis. The magnitude of stability was decreased as following order; PRO＞MET＞BIS＞ATE＞PIN. Among them PRO showed the highest affinity towards CM-$eta$-CD with stability constants of 383 and 371 $M^{-l}$ for (R)- and (S)-enantiomer, respectively. PIN enantiomers showed the lowest stability towards CM-$eta$-CD, while the selectivity between (R)- and (S)-enantiomer was higher than any other tested $eta$-blocker.r.