A new kind of moent method using curved wire segments is used in this paper to analyze a kind of frequency independent antenna-two arms conical log spiral antenna. By using the curved wire Segments to represent the antenna’sstructure and the properties of the central symmetric matrix

the calculation time is much reducecl and the accuracy and speedis enhanced. This program is also suitable to plane spira and conical spiral antennas. This paper also presents a lot of data andcurves and they are verified by the references and experiments. Their results matched fairly well.