Abstract：The S/N ratio and resolution of seismic data are most basic issues of seismic data processing.The key techniques of improving S/N ratio of seis-mic data are follows:1.suppressing noise and high-lighting useful signal;2.making efforts to fulfill in-phase stack;3.better handling the relation between resolution and S/N ratio.In view of above-men-tioned key techniques,the paper expounded some key techniques of improving S/N ratio processing in following aspects:arranging noises under cate-gories,interference suppression,noise attenuation and in-phase stack etc,compared advantages and disadvantages and adaptive conditions of different noise-eliminated methods and describe the selection of used parameters in part of methods.Finally,it is shown by the cases that it should use different noise-eliminate methods when the noises are differ-ent.
