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Degradations of methylene blue by sonocatalytic method using WO3-ZnO composites have been conducted. The stages of this research were composting the WO3−ZnO through a solid-state reaction then followed by material characterization using X-Ray Diffraction (XRD) and Scanning Electron Microscope (SEM) instruments. Sonocatalytic on methylene blue was assisted by 40 KHz ultrasonic and the degradation percentage was calculated based on data obtained from UV-Vis spectrophotometer. The XRD analysis of WO3−ZnO was found that the samples contained WO3 and ZnO there was also a ZnWO4 diffraction peaks and SEM analysis it was observed that there are two particles, small and large particles where the large size was thought to be WO3 particles and ZnO particles which were small, both particles joins tend to agglomerate. The results of the degradation test on methylene blue with a concentration of 30 ppm showed that the optimum condition for WO3−ZnO was 0.4 g and contact time was 15 minutes with a degradation percentage of 86%. [ABSTRACT FROM AUTHOR]