As the future development direction of green aviation, electric aircraft has attracted wide attention from various countries. Most electric airplanes adopt a large aspect ratio aerodynamic layout, and the wings deform elastically during flight. The focus of the wind tunnel test results cannot reflect the actual flight requirements well. The focus of the wind tunnel test results cannot reflect the actual flight requirements well. This article is to determine the center of gravity range of light electric aircraft and get the accurate focus position in flight. Taking a certain type of carbon fiber composite material electric aircraft as an example, a mathematical model of steady straight and level flight and steady circling maneuvering flight was established. Based on the test data obtained from the circling maneuver flight test, the object understanding algorithm is used to identify the actual flight focus and compare it with the focus position measured by the wind tunnel experiment. The results show that the focal position of the aircraft identified by the circling maneuver flight test is higher than the result of the wind tunnel test.