(1) Gallein forms a blue coloration or precipitate with load ions.Sensitivity:0.2γ(1:5, 000, 000).Cu, Ce, Sb and Sn(Ⅱ, Ⅳ) interfere.(2) The composition of lead galleinate was determined by means of hetercmetric titration method and elope ratio method.The ratio of reagent to lead in the compound formed in alcohol medium was found to he 2:3, while that in aqueous.medium(pH 8), 1:1.