Beta Blocker therapy is a mainstay of treatment following acute coronary syndromes (ACS), particularly acute myocardial infarction (MI). Studies have repeatedly demonstrated the benefit of Beta blocker therapy following either ST-segment elevation myocardial infarction (STEMI) or non-ST-segment elevation ACS,and Beta blocker therapy has been a performance measure used to grade hospital performance by the Centers for Medicare and Medicaid Services and Joint Commission on Accreditation of Healthcare Organizations.Although the benefit of Beta blocker therapy has been clearly demonstrated, the doses that have been used in many of these studies are significantly higher than those typically used currently in clinical practice.The benefit of Beta blockers has been ascribed to dose-related heart rate reduction,although alternative mechanisms for their benefit have also been proposed.In addition, the classical Beta blocker trials were performed decades ago, before the modern therapeutic era,which includes reperfusion therapy, potent antithrombotics, and statins. This raises the question of whether titration of Beta blocker therapy to the high doses that had been previously studied provides substantial incremental benefit in current clinical practice over the more frequently prescribed and clinically tolerated doses of Beta blockers.Moreover, a recent study has reported that high-dose Beta blockers were not superior to low-dose Beta blockers,aprovocative finding requiring validation. And until now, there has been no registry on patients with ACS about Between Beta-blocker Treatment in Henan, the most populated (about 100 million) and predominantly rural (66%)province in central China.