Based upon the tunneling Hamiltonian, the lifetime of electrons in the
quasibound state of quantum dots with single and two quasibound state
s is calculated analytically. It has been shown exactly that the lifet
ime of electrons remaining in one of the quasibound states for two-qua
sibound-state quantum dots is shorter than that for single-quasibound-
state quantum dots with the same resonant energy.