Abstract: Objective To investigate the reasons, fnal health state and fight conclusion in pilots for modifed high performance fghters who were temporarily grounded by physical examination. Methods Clinical data about 67 pilots who were temporarily unqualified for flying modified high performance fighters after examination were analyzed. Results The causes of temporarily grounding were poor special functions, surgical disorders, medical disorders, neuropsychologic disorders, ophthalmologic disorders, otorhinolaryngologic disorders, respectively; Forty-seven pilots were qualifed (10 cases were qualifed to new fghter, and the other 37 pilots were qualifed to the former fghter), and 20 pilots were permanently grounded (2 cases by new diseases, and the other 18 pilots by former diseases) after physical examination. Conclusion The main reason of temporarily grounding in physical examination of pilots for modifed high performance fghters is the special function problem. "Requirement of physical constitution for pilots of high performance fghter aircraft" refects the reality, and the system of annual physical examination of pilots needs to be revised.