This study was conducted to identify the effects of intake of beta-blocker and aerobic exercise on heart rate recovery (HRR) and exercise capacity after maximal exercise in acute coronary syndrome patients (ACS). Subjects were divided into 4 groups; Beta-blocker-Exercise group (n=10), Beta-blocker group (n=10), Exercise group (n=10), Control group (n=10). Symptom-limited grade exercise test were conducted on subjects pre- and post- 6 week study, to measure maximal heart rate, heart rate at 1 minute and 2 minutes at the recovery stage, maximal oxygen uptake and maximal exercise time. Study resulted in significant improvements in heart rate recovery for BB-Ex group ($17.40{pm}5.58$ bpm to $26.10{pm}6.66$ bpm), maximal oxygen uptake for BB-Ex group ($30.46{pm}8.63$ to $36.33{pm}8.10$) and Ex group ($29.04{pm}4.93$ to $34.31{pm}5.19$), and total exercise time for BB-Ex group ($906.30{pm}158.57$ to $1018.50{pm}151.21$), BB group ($805.70{pm}182.94$ to $897.50{pm}160.16$) and Ex group ($870.00{pm}145.63$ to $961.90{pm}107.29$). Therefore it showed the biggest improvement for heart rate recovery and exercise capacity in acute coronary syndrome patients when both Beta-blocker and aerobic exercise were in effect.