The energy spectra of velocity components in wall-bounded turbulence provide significant insights into the turbulent structure, particularly in terms of length scale and wall-normal location. This is especially relevant for high Reynolds number (Re) wall-bounded turbulence, where the energy spectra display distinct characteristics. These include the scale separation between the near-wall and outer flow and the linear scale growth with wall-normal distance. However, several theoretical predictions regarding wall-bounded turbulence still need to be proven. For instance, the existence of a k−1 region in the spectra is still controversial. This ambiguity may stem from the effects of low Reynolds numbers in existing data or possibly because wall-bounded turbulence inherently lacks such behaviors. In this presentation, we will delve into the energy spectra of velocity components in depth and discuss the mechanisms of energy spectra transport in detail.