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We present a self-consistent approach to deal with the pairing-fluctuationeffects in quasi-two-dimensional superconducting systems. Besides the Cooperpairs in the Bose-Einstein condensate, there are pairs occupying the excitedstates, which results in the predominant fluctuations. The low-lying excitedstates are the collective modes. On the basis of ladder-diagram approximation,we treat the single particles and the pairs on an equal-footing manner. TheGreen's function of single particles is obtained as an analytic solution to acubic equation. The bosonic degrees of freedom are relevant to the pseudogapphysics in the high-T_c cuprates. The superconducting order parameter and thetransition temperature are substantially reduced from the values of themean-field theory. The calculated phase boundary of superconducting state canreasonably describe the experiment data for cuprates.Comment: 9 pages, 1 figure, 2 table

PAIRING-FLUCTUATION EFFECT IN QUASI-TWO-DIMENSIONAL SUPERCONDUCTIVITY