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In this paper we describe the molecular and crystal structures of the K3[Y(NTA)2(H2O)] · 6H2O(H3NTA = nitrilotriacetic acid). The crystal data are as follows: monoclinic system, C2/c space group, a=1.5268(3) nm, b=1.2833(3) nm, c=2.6079(5) nm, 3=96.03(3)°, V= 5. 0815(18)nm3, Z =8, M=708.68, Dc = 1. 852gcm-3,μ=2. 875mm-1, F(000) =2880. The final R1 and wR2 are 0. 0636 and 0. 1523 for 4264 [Ⅰ> 2.Oσ(Ⅰ)] unique reflections and 0. 1178 and 0. 1651 for all 4364 reflections, respectively. In the title complex, the anion [Y(NTA) 2(H2O)] 3-has a nine-coordination structure with distorted monocapped square antiprism. Each group acts as a tetradentate ligand with three O atoms and one N atom and a H2O molecule caps a quadrilateral face as a ligand. It can be known that the Y (Ⅲ) ion can form a high-coordinate compound with aminopolycarboxylic acid ligands because it has a larger ionic radius (0.104nm).