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W e have studied the influence of thermal photons on the symmetry between the field and atomic squeezing (SFAS) exposed in the resonant vacuum-field Jaynes-Cummings model with an initially coherent atom. W e have shown that when the number of thermal photons ( N a u ) is less than 0.01, the SFAS is not sensitive to the presence o f thermal photons; when N,, 2 0.01, the broken SFAS can be seen; when N,, 2 0.1, the squeezed atom cannot radiate a squeezed field any longer. Also. we have discussed the possibility of detection of the boken symmetry in superconducting maser cavity.