Based on special resonance lineshapes, optical cavity becomes a particularly important lightwave device in technologies like laser, precision detection, optical sensing, optical switching, and so on. In this work, we review the reported different resonance lineshapes in the optical cavity (including Lorentzian peak, Lorenzian dip, asymmetric Fano shape, etc.), and then discuss their physical mechanisms. Finally, with the silicon-based microring cavity as an example, we propose methods and corresponding device structures to control these resonance lineshapes.