Based on several ultrasonic suspension models, i.e. Urick, Urick-Ament, HT and Mcclements, the Scholte wave propagation characteristics are analyzed at the interface between sediment concentration two-phase fluid and porous medium solid. The interface wave propagation characteristic equation are found using the complex wave number equation given by the aforementioned four models. Relationships between Scholte velocity and the two-phase fluid properties, (e.g., dispersion, volume content, particle size) are discussed. Scholte wave propagation and signal are obtained by Comsol simulation. By using the time delay estimation method, it is found that the obtained Scholte wave velocity are in accord with that given in Urick-Ament and HT models.