Because buffer is significant for routes and switches energy consumption in network. This paper proposes an energy consumption model of buffer-less self-routing grouping switching. The model with grouping switching fabric constructed by G statistical multiple routing units and Banyan-type exchanges. Based on blocking probability and time delay requirement buffer-less, the number of input/output extensibility and exchange between stages optimal layout are used to save energy. The quantization comparing between buffer energy consumption and buffer-less switching fabric energy consumption based on same network performance shows that: the latter energy consumption is less than the former. The simulation result shows that: the lager parameter G is, the less energy consumption of routing unit is, the less parameter k is, the less energy consumption of routing unit is, and energy consumption of Divide-and-Conquer (DC) exchange between stages is least among Banyan-type switching network.