The invention discloses a Synthesis of lithium ferrous phosphate which is anode material of lithium ion battery. The material synthesis is as follows: geeting lithium salt, malysite and mammonium dihydrogen phosphate, according to the mole ratio of lithium ion: iron ion: phosphate radical ion is (0.8-1.2):(0.8-1.2):(0.8-1.2), getting compound A of equal proportion, joining some compound A in aqueous solution B which contains soluble salt and soluble organic species, putting it in high temperature furnace, then cooling naturely, compounding ferrous phosphate powder containing carbon and adulterating metal ion, milling the synthetical aqueous lithium solution powder, controllong the grain diameter between 1-50 mum. The synthetical material of this invention distribute equally, using this material as positive material can improve batteries' charging capacity effectively.