Antimultiple processing is an important step in marine seismic data processing. The multiple waves in marine seismic data are generally rather strong and very difficult to suppress, so the suppression of multiple waves decides the quality of processing results. There are many ways to suppress multiple waves; nevertheless, different approaches are based on different theories and have different targets. A single method can not suppress all multiple waves and hence fails to achieve the desired results. The authors employed the combined multiple wave attenuation technology, which combines SRME, radon transform and lift denoising to suppress multiple waves in actual marine seismic data, and has achieved good results.