Abstract: The "linear reactor" made by polyethylene glycol(PEG) and water was used to assembly a series of one-dimension nano-sized crystals of title compound in various lengths(200 nm~2.2 μm) and diameters(20~60 nm). The length and diameters of the nanocrystals could be adjusted by changing the molecular weight of PEG and the content of water in the system. The main phase of the nanocrystal formed in reactor is found to be identical with that of the single crystal self-assembled in water. The analysis of X-ray single-crystal diffraction revealed that the donor atoms in the equatorial plane of the square pyramid geometry configuration of copper ion are imino nitrogen atom and two carboxylate oxygen atom from two different ligands and a water molecule is located in the axial position. The adjacent structural units are connected through the coordination of carboxylic oxygen from iminodiacetic acid with Cu(Ⅱ) to form one-dimension zigzag chain structure, and the definite chains construct a one-dimension nanocrystal through hydrogen-bondings.