The AVO technique is mainly used to study the variation regularity of seismic wave amplitude with the migration distance, and the distribution of the 3D seismic data directly influences the effects of AVO processing. The designing and utilizing of old 3D data failed to consider the special requirements of AVO technique, which caused some degrees of distortion in AVO attribute. Aimed at solving this problem, this paper has analyzed the requirements of AVO for the designing of the 3D observational system and put forward an AVO observational system, which can not only suit the traditional 3D exploration but also meet the specific needs of the AVO technique.