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The broad-line region (BLR) of flat-spectrum radio quasars (FSRQs) could havea "flat" geometrical structure to allow GeV gamma-ray photons escape, toproduce the observed gamma-ray flares with short timescales. In this paper, wecollect the quasi-simultaneous spectral energy distributions (SEDs) of the FSRQ3C 454.3 obtained by the multi-wavelength campaigns spanning from 2007 July to2011 January, and use a model with the "flat" structure BLR, the accretion discand the dust torus to explain the SEDs of gamma-ray outbursts. We obtain thefollowing results: (i) The jet is almost in equipartition between magnetic andparticle energy densities during the outbursts; (ii) When the emitting regionlocates inside the cavity of the BLR, the covering factor $f_{\rm BLR}$ of theBLR is very small; as the emitting region goes into the BLR structure, $f_{\rmBLR}$ increases. (iii) The aperture angle $\alpha$ describing the BLR structureis about $45^{\circ}$; (iv) The central black hole (BH) mass is about $5\times10^{8}$\,$M_{\odot}$ rather than $4.4\times 10^{9}$\,$M_{\odot}$.

Modeling the spectral-energy-distribution of 3C 454.3 in a "flat" broad-line-region scenario