Since the KEKB is a factory machine, a well-controlled operation of the injector linac is required for minimizing tuning time and a stable operation. A beam-energy-spread monitor(ESM) is under development in order to control and stabilize an energy spread of high-current single-bunch electron beams for producing a sufficient number of positrons. It is very important to control the beam energy spread from the preinjector to the 180-degree arc setction where the beam energy is 1.7GeV, because to preserve the emittance and to reject any beam blowup. The author has proposed a new ESM using multi-stripline electrodes in order to reinforce this purpose. This report describes the basic design of the monitor using a numerical analysis. The analysis result shows that the resolution of the energy spread is expected to be 0.3% for the nominal operation conditions.
 S. Kurokawa, et al., 'KEK B-Factory Design Report,' KEK Report 90-24 (1991).
 I. Sato, et al., 'Design Report on PF Injector Linac Upgrade for KEK,' KEK Report 95-18 (1996).
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