We investigate the light-scattering intensity on three-dimensional cluster-cluster aggregations. The effect of reversible aggregation on the light-scattering intensity is clarified in terms of numerical simulations. For the case of weak interaction between particles, there is no peak as a function of the scattering wavenumber q in the static light-scattering intensity. We find that the profile of the light-scattering intensity on reversible cluster-cluster aggregations is apparently different from that for diffusion-limited cluster-cluster aggregations.