A method synchronously computing longitudinal maneuvering flight and flight loads based on nonlinear wind-tunnel test aerodynamic forces (experimental aerodynamic forces for short)was proposed. The coefficients of lift and pitch moment of experimental aerodynamic forces were introduced into the longitudinal maneuvering flight computation by use of surface spline, and flight loads on overall aircraft were elastically corrected based on pressure distribution of experimental aerodynamic forces simultaneously. Elastic loads were obtained utilizing linear aerodynamic influence coefficient matrix. The aerodynamic forces were also presented using double-lattice method (theoretical aerodynamic forces for short). The computed results using experimental and theoretical aerodynamic forces were compared. The results show that the maneuvering flight based on experimental aerodynamic forces is more reasonable and the change of flight loads using theoretical aerodynamic forces may be incongruous with that using experimental aerodynamic forces during maneuvering flight.