The strip edge reflections of the ordinary single electrode interdigital transducer are quite obvious because of the in phase of the scattered waves induced from two adjacent electrodes. The wave reflections may result in the electrode interaction perturbations in the surface acoustic wave device. The split finger interdigital transducer (also called double finger transducer) can be used to minimize this second order effect. In this paper, a new algorithm based on the Fourier transform of the surface charge distribution is proposed to analyze the characters of the split finger interdigital transducer. The surface charge distribution is obtained through the field theory. The model can accurately reflect the harmonic as well as the fundamental frequency response of the split finger interdigital transducer with considering neighbor interactions.