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                                 Abstract:With GEANT3 frame, we simulate the lead-scintillating fiber type barrel shower counter (BSC) of BESⅢ. The structure of BSC in the simulation is analogous to Φ Factory's, and it's thinkness is 14.4X 0. The simulations show that the shower time information read-out is necessary for improving the Z spatial resolution, the π0 invariant mass resolution and for rejecting fake photons. Also, the energy resolution σ E/E(6%/E), the relation of angle resolution σ with readout granularity and the relations of mass resolution of π0 σ m/m with light yield, attenuation length, readout granularity are given, where m is the invariant mass of π0 reconstructed by two photons.
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                        References
	
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