Background: Abdominal surgery involves a surgical repair, resection or reconstruction of organs inside the abdominal cavity. This may include surgery on the stomach, gallbladder, small intestine (colon), liver, pancreas, spleen, esophagus and appendix affected by infection, obstruction, cancerous growth or inflammatory bowel disease. Post Pulmonary Complications (PPCs), are defined as pulmonary anomalies taking place in the postoperative period producing clinically notable, identifiable disease or dysfunction that critically affects the clinical course. As deconditioning is one of the most common and unnecessary causes of morbidity and mortality, the interventions that are implemented should have the potential to increase the strength of the respiratory muscles and accordingly, expand exercise performance and functional capacity as indicated. The aim of the study was to determine the effect of lung boost device on inspiratory muscle strength training in abdominal surgery patients. Material and Methods: Thirty participants between the age of 20 to 70 years that underwent abdominal surgery were selected and received inspiratory muscle training by lung boost device for twice daily 6 times in a week for 2 weeks. Pre and post intervention assessments were done by PIMax and 6MWD. Result: Result of this study showed significant difference in the PIMax and 6MWD when treated with Lung Boost device. Conclusion: The study concluded that use of Lung Boost device causes significant improvement in inspiratory muscle strength and 6MWD in group of abdominal surgery patients and so addition of Lung Boost device in patients with abdominal surgery will increase the strength of inspiratory muscle as well as the functional capacity. KEY WORDS: Abdominal surgery, Lung Boost device, Maximal inspiratory pressure (PIMax), 6Minute Walk Distance (6MWD).