Abstract: The lithium ion adsorbents are mainly divided into two kinds at home and abroad，one kind is the manganese adsorbent，another kind is the titanium adsorbent.Not only the capacity of Mn adsorption is low，but also the loss is large in the acidic washing-and filtration-processes.So it is difficult to achieve industrial production.Adsorption of Ti has high adsorption capacity，and the internal structure maintains stability during the adsorption-and desorption-processes，and the loss is smaller.Absolutely the prospect for the study is bright.With TiO2 and Li2CO3 as raw materials，their ratio was strictly controlled.The solid-phase synthesis reaction was made at the different high temperatures and the precursor of lithium ion sieve Li4Ti5O12 was obtained.Then 2 mol/L hydrochloric acid was used on the precursor of lithium ion sieve for elution.When the lithium in the ion sieves were totally washed down，the new lithium ion adsorbent H4Ti5O12 was prepared.When finished the saturated adsorption experiment by using of this adsorbent，its saturated adsorption capacity QT reached 32.29 mg/g.

Key words: ion sieve, adsorbent；Li4Ti5O12 ；acidic washing modification