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                                 Abstract:A method is developed to study the optimized BES data taking time after each injection. For current ψ′ data taking,the optimized data taking time is 3-5 hours. The method can be generalized to other experiments.
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                        References
	
			| [1] | . ZHANG C, TANG J Y. Proceedings of the Workshop on BEPC Luminosity Upgrades, IHEP-01,Beijing,1991;FANG S X. The BEPC Upgrade, Third Workshop on the Tau-Charm Factory, Marbella, Spain, June1993,editted by Kirkby J. and Kirkby R2. BAI J Z et al. Nucl. Instr. and Meth. in Phys. Res.,1994,A344:319—334 |  
 
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				| [1] | GUO Yun-Jun
								, HE Kang-Lin
								. Muon Identification Using the Efficiencies Ratio Method at BESⅡ. Chinese Physics C,
							2007, 31(11): 1050-1055. |  
 
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