Abstract:S*wave is not a geometrical wave, and its strength depends on normal distance from seismic source to an interface, when the normal distance from exploding point to an interface is smaller than a dominant wave length, the amplitude of S* wave is quite strong, and increases exponentially with the decrease of the normal distance. S* wave radiates from source projecting point on an interface. The radiated energy is zero at horizontal incidence and increases to the maximum when θ*=sin-1(β/α), where θ* is the included angle between ray and the normal line of the interface, α and β respectiveiy the velocities of P-wave and S-wave. When the projecting point is nn an interface in layered medium, there occur both S* wave and Sn* wave which travels along the interface and has the property similar to that of head wave. The physical model experiment proves the existence of S* and Sn* waves, which offers us a basis to use S* and Sn* waves in multiwave and converted wave explorations.