A neuromorphic system for switching between a multitude of functional operations includes a controlling unit and a neuron unit. The controlling unit provides a first input and a second input and regulates a multitude of bias currents. The neuron unit receives the bias currents. An input neuron group receives the first input and the second input. An excitatory neuron group is stimulated by the input neuron group. An inhibitory neuron group is electrically connected to the excitatory neuron group, and the inhibitory neuron group and the excitatory neuron group stimulate each other. An output neuron is electrically connected to the excitatory neuron group and stimulated by the excitatory neuron group to generate an output. The bias currents control the excitatory neuron group, the inhibitory neuron group and the output neuron to be in one of a high-activity state, a middle-activity state and a low-activity state.