Effect of ultrasonic treatment (UT) on the catalytic and textural properties of composite catalyst systems based on zeolite HTsVM modified with rhodium and chitosan has been studied. The introduction of a rhodium-chitosan composite and UT have a significant effect on the catalytic properties of the zeolite catalyst in the conversion of dimethyl ether (DME) to lower olefins by providing a substantial increase in the catalyst activity; the effect is attributed to a more finely dispersed distribution of rhodium over the catalyst surface. Using transmission electron microscopy (TEM), it has been first shown that UT leads to a decrease in the rhodium particle size and a finely dispersed distribution of Rh over the surface of the zeolite catalyst.