Traditionally, diffractions are always regarded as a special type of noise, considering that the mechanism of diffraction wavefields is completely different from that of reflection wavefields. Most routine imaging methods, which incline to take the full wavefield as a reflection wavefield, might lead to blurry images, and many useful signals are probably veiled by the influence of seismic diffractions. However, seismic diffractions carry valuable information related to structures and caved reservoirs, and they might cast new light on special understandings about complex geologies of the subsurface. For different imaging purposes, two complementary aspects make use of seismic diffractions. On one hand, a specularity-weighted stack technology images better sequence strata by suppressing diffractions and other noises. On the other hand, diffractions are extracted from dip-angle gathers with generalized Radon transform and then are imaged separately to reveal more potential drilling targets.