The evaluation and analysis of diffusivity of lithium for coarsening and coarsening kinetics of δ` precipitate in Al-Li-Cu-Mg-Zr alloy aged at 170℃ have been investigated by transmission electron microscopy. With ageing time, δ` precipitate coaesened to followed γ￣∝t^(1/3) and coarsening kinetics was found to be obeyed to the Lifshitz-Slyozov-Wagner(LSW) theory and diffusivity of lithium for coarsening of δ` precipitate in Al-Li-Cu-Mg-Zr alloy was obtained to be 5.85×10^(-17)∼1.53×10^(-16) by experimental coarsening rate constant and various coarsening kinetic theory. Diffusivity of lithium measured by using various model but MLSW and Tsumuraya(VI) et al. model in Al-Li-Cu-Mg-Zr alloy is similar to that calculated by the Costas`s diffusivity equation. It was, therefore, suggested that additing to the Cu, Mg and Zr element in Al-Li system have no great effect on diffusivity of lithium for coarsening of δ` This suggest that in matrix.