Thank you. But could you please tell more details? In fact, I have a stl file which is a surface mesh segmented from human anatomy and then I generate volumetric mesh in Ansys ICEM. What I need to do is extracting the coordinates of boundary nodes, then I can get the displacement of these nodes (combined with other results) and further use them as boundary condition of fem (In other words, I want to load the displacement of boundary nodes). What do you mean by selecting particular boundary zone? Combined with surface mesh representing the object? I have no idea exactly. Your advice is highly appreciated!