Abstract: An effcient algorithm to compute the equivalent circuit model parameters of SAW filter is proposed.This method is based on the charge distribution in the interdigital transducer calculated by the Remez optimazation design and takes into account the interaction of acoustic wave and electrostatic field within the IDTs.The parameters are only depended on the charge distribution,weighted coefficients and IDT overlap pattern.The simulations prove that this method is simple,precise,and fast,and can be used to optimize further practical specfication of SAW filter.