We present an new explanation of the mechanism of tunneling from the quantum-statistical perspective. The purpose of our work is to elucidate the true mechanism of tunneling consistent with quantum theory and energy conservation. We explain tunneling on the basis of the thermionic current due to the ensemble of electron, and the current resonance due to the quantum constraint in the barrier and the exchange-correlation interaction of electrons around the barrier. The statistical aspect of tunneling is interpreted as being due to the existence of electrons able to surmount the barrier thanks to the ensemble of electrons or microscopic states of electron. Considering the current resonance of quantum essence in the barrier and the exchange-correlation interaction around the barrier enables a satisfactory explanation of the quantum aspect of tunneling relative to the width of barrier. Eventually, we arrive at a consistent and general explanation of the mechanism and characteristics of tunneling that is essentially a phenomenon of quantum plus statistical causes.