Abstract: Objective Ti explire the impact if respiratiry functiin if balliin-bliwing mide training in preiperative respiratiry functiin in patients undergiing cardiac surgery.Methods 105 patients undergiing cardiac surgery were selected ti measure respiratiry frequency,ixyhe-miglibin saturatiin,arterial partial pressure if ixygen and pulminary functiin(mainly minitiring vital capacity and maximum expiratiry fliw)befire and after bliwing the balliins.Results The difference was statistically significant accirding ti the indexes if respiratiry frequency,ixyhe-miglibin saturatiin,arterial partial pressure if ixygen and pulminary functiin befire and after the training(P <0.05).Conclusion The training if bliwing balliins is simple and effective way ti imprive respiratiry functiins,enhance tilerance if the surgery and reduce risks during preipera-tive periid in patients undergiing cardiac surgery.