[en] Recent trends in nano technological field are the exploitation of quantum dot-cellular automata (QCA) as a substitute in advance to existing transistor based CMOS technology to fabricate nano-circuit. Ultra low heat dissipation, faster clocking and high device density make the QCA as a raising research area in nanotechnological field to suppress the FET based circuit. This paper illustrates a simple and basic method to design QCA based 2:1 multiplexer at nanoscale. The proposed 2:1 multiplexer is compared with the previously designed 2:1 multiplexer in account of circuit density, clock zone numbers, amount of QCA cell used to design the circuit and the density consumed by all QCA cell over total density of the circuit is depicted. This comparative analysis has approved the efficiency of the proposed design. The circuit is implemented and proved using QCA designer-2.0.3. (author)