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Assembly operations at the nanometer scale differ from the conventional scale (greater than millimeter)assembly operations in two important aspects. Firstly, the continuium assumption in the assembly components does not apply. We clearly have to account for each atom and the bond distances between them. Secondly, the weak forces such as van der Waals and electrostatic forces beome the dominant factors. Although many conventional assembly theories and practices may be similarly applied in nanometer scale, these differences require some important changes to be made. To address these issues, a virtual assembly environment that captures the underlying physical law in nanometer scale is presented. Particular emphasisis is given to the hapticc display.