Abstract: Lowprofile antenna on an arbitrarily conducting body are analyzed as a whole by the method of moment(MoM). The RaoWiltonGisson(RWG) basis function and triangular basis function are chosen to discretizate the conducting body and thin wire, respectively, and a special basis function is used to represent the current on the wire/surface junctions. The coordinate transformations, integral transformations and dimensionality reduction are employed to achieve the precise and rapid calculation of the singular integral. The availability of the method is demonstrated by a monopole mounted at the square plate. Finally, lowprofile ring antennas mounted on the conducting cube are studied and numerical results are valuable to the lowprofile antenna or antenna array design on complex targets.