A new description of the halo's dynamics is introduced. The response of haloes interacting with the accretion and the tidal field is described analytically in the non-linear and secular regime via a perturbative approach. It relates the dynamical properties of a population of such objects to the statistics of their environment. The latter are deduced from cosmological simulations and first results on the anisotropy of accretion, its kinematic properties and the two-point correlation of the tidal field and the density flux of mass are described. This approach should allow to predict the statistical properties of the dark matter tracers within the galaxy (e.g. Lensing, X Emission) or conversely, use these observational probes to constrain the characteristics of haloes' environments.