On the base of introduction of circular cavity eigenfield and its reflection coefficient，the self-consistent field description of whispering-gallery mode （WGM） in circular cavity is discussed. Accroding to the self-consistency，the same eigenvalue equation as the one directly deduced from the Helmholtz equation determining WGM is obtained. Also based on the wave-ray correspondence of circular cavity eigenfield，the self-consistent ray description of WGM is discussed. The results of resonance wavenumbers and the Q-factors of WGMs deduced from the intuitive self-consistent picture of eigenray beam are well coincident with the ones obtained by directly solving the eigenvalue equation.