To enhance the applicability of function-substitution method,an improved function-substitution based modeling method for LPV systems is proposed and applied on modeling of the longitudinal system of morphing UAV. Partial linearization is introduced to function-substitution method,thus the varying parameters can be chosen more flexibly and the number of varying parameters can be reduced. After that,the LPV model for longitudinal system of morphing UAV is derived using the proposed method and the simulation r...