Reversible circuits, nowadays, have found grounds * Depth: The number of l1x or 2x2 reversible gates in many applications such as low power CMOS design and which are in the longest path from input to output. quantum computing. In reversible circuit design, decreasing Reduction of these three parameters simultaneously is three parameters is of interest: quantum cost, depth of the circuit difficult. Therefore, one or two of them are usually opted as and the number of garbage outputs. On the other hand, recently, t t decimal computer arithmetic, for the sake of its preciseness, gains the main parameter for minimization and try to reduce others popularity. Given that the BCD digit adder is the basic unit in as much as possible. In this paper a new method for designing decimal arithmetic, in this paper we propose a new reversible reversible circuits, with the aim of minimizing the depth of the design for this unit with the aim of minimizing the depth of the circuit is proposed and applied to the reversible one digit circuit. Furthermore, we show that the proposed designing BCD adder. Since depth in reversible circuits can be method can be applied to any other reversible circuit for considered as the latency in classic circuits, the proposed reaching the minimum depth.