Here we present the results of ordered structure formation within undercooled liquid rhodium by molecular dynamics method. During the cooling of liquid rhodium, the enthalpy decreases linearly before the temperature drops to 1900 K, then it has a steep decline. This structure change is clarified by the pair distribution functions. The appearance of peaks beyond the first neighbor distance suggests that ordered atomic clusters come into being. Meanwhile, the self diffusion coefficient and the atom number density are employed to display the structure change. This work provides the density data of liquid rhodium from 1900 to 2800 K including 336 K undercooling. (C) 2011 Elsevier B. V. All rights reserved.